Carpet cleaning, for beautification, and the removal of stains, dirt, grit, sand, and allergens can be achieved by several methods, both traditional and modern. Clean carpets are recognized by manufacturers as being more visually pleasing, potentially longer-lasting, and probably healthier than poorly maintained carpets. Sanitary Maintenance magazine reports that carpet cleaning is widely misunderstood, and chemical developers have only within recent decades created new carpet-care technologies. Particularly, encapsulation and other green technologies work better, are easier to use, require less training, save more time and money, and lead to less resoiling than prior methods.
Hot water extraction vs steam cleaning
Although there is an industrial cleaning process that is in fact steam cleaning, in the context of carpet cleaning, "steam cleaning" is usually a misnomer for or mis-characterization of the hot water extraction cleaning method. The hot water extraction cleaning method uses equipment that sprays heated water (not steam), sometimes with added cleaning chemicals, on the carpet while simultaneously vacuuming the sprayed water along with any dislodged and dissolved dirt. Many carpet manufacturers recommend professional hot water extraction as the most effective carpet cleaning method. Actual steam could damage man-made carpet fibers or shrink natural fibers such as wool.
A variety of hot water extraction carpet cleaning equipment is available, with less expensive equipment marketed for purchase or rental by homeowners, and more expensive equipment used by professional carpet cleaners. The more expensive commercial equipment may employ a rotating high pressure spray and extraction disc. This allows the equipment to achieve many spray-extraction cycles independent of the forward or backward motion of the machine.
Hot water extraction carpet cleaning equipment may be a portable unit that plugs into an electrical outlet or a truck mount carpet cleaner requiring long hoses going from the truck or trailer to the room requiring cleaning. Truck mounted equipment is advantageous where electricity is unavailable (e.g. for cleaning premises where the electrical service was terminated when the premises were vacated by a departing tenant.) Truck mount carpet cleaning may be unsuited to premises distant from a driveway or road, and hoses may need to pass through windows to reach upper floors of a building. Hoses needed for truck mount and professional portable carpet cleaning may present an inconvenience or tripping hazard to users of hallways, and pets or children can escape through doors that must be left ajar for hoses. Heated or air conditioned air will also escape from buildings when doors are left open for hoses. This could create a significant waste of energy in some climates. While truck mounted carpet cleaning equipment minimizes noise in the room being cleaned, truck mounted carpet cleaning equipment may cause noise and air pollution offensive to neighbors and may violate anti-idling bylaws in some jurisdictions. However truck-mounted cleaning is much faster than portable equipment and extra heat and power can give better results and faster drying times.
In high-pressure hot water extraction ("steam cleaning"), after preconditioning, with alkaline agents such as ammonia solution for synthetic carpets or acidic solution (such as vinegar solution) for woolen carpets, and agitation with a grooming brush or an automatic scrubbing machine, a pressurized manual or automatic cleaning tool (such as a wand) passes over the surface several times to thoroughly rinse out all preconditioner, residue, and particulates. If an alkaline detergent is used on a woolen fibre, use of an acetic acid solution will restore neutral fiber pH. The acid rinse thus neutralizes the alkaline residues, and can contribute to softening cleaned fabrics.
The steam-cleaning system uses detergent-based solutions. The surface is saturated, typically taking 12-24 hours to dry. Some carpet-cleaning solutions are carbonated to dissolve organic material more effectively. Beyond these treatments, antistaining and antisoiling products can be applied by the carpet owner, and have for this reason become recognized in the carpet-cleaning industry as some of its biggest profit centers.
Extraction is by far the most important step in this process. Since the hot-water extraction method uses much more water than other methods like bonnet or shampoo cleaning, proper extraction and air flow are critical to avoid drying issues. Drying time may also be decreased by extra use of fans, air conditioning, and/or outdoor ventilation.
Older surfaces, such as double jute-backed carpets and loose rugs with natural foundation yarns, could shrink after a wet treatment, leading to suppositions that wet-cleaning could also remove wrinkles. However, this notion is antiquated and this method could also occasionally tear seams or uproot strips. Newer carpets, such as with synthetic backing and foundation yarns, do not shrink, and they smooth easily; in such carpets, wrinkles indicate an underlying problem, such as adhesive, that may need a certified carpet inspector to determine.
Wet-cleaning systems naturally require drying time, which has led to customer fears and concerns about very slow drying, the risk of discoloration returning during drying, and odors, bacteria, fungi, molds, and mildews. Balancing the need for rapid drying (attributable to lower flow rate through the cleaning jets of a spray system) and the need to remove the most soil (attributable to higher flow rate) is a key technique that must be mastered by carpet-cleaning technicians.
Pretreatments similar to those in dry-cleaning and "very low moisture" systems are employed, but require a longer dwell time of 15 to 20 minutes, because of lower amounts of carpet agitation. Ideal pretreatments should rinse easily and leave dry, powdery, or crystalline residue that can be flushed without contributing to re-soiling.
Dry-cleaning
Many dry carpet-cleaning systems rely on specialized machines. These systems are mostly technically "very low moisture" (VLM) systems, relying on dry compounds complemented by application cleaning solutions, and are growing significantly in market share due in part to their very rapid drying time, a significant factor for 24-hour commercial installations. Dry-cleaning and "very low moisture" systems are also often faster and less labor-intensive than wet-extraction systems.
Heavily soiled areas require the application of manual spotting, or of pretreatments, preconditioners, or "traffic-lane cleaners", which are detergents or emulsifiers that break the binding of different soils to carpet fibers over a short period of time, commonly sprayed onto carpet prior to the primary use of the dry-cleaning system. One chemical dissolves the greasy films that bind soils and prevent effective soil removal by vacuuming. The solution may add a solvent like d-limonene, petroleum byproducts, glycol ethers, or butyl agents. The amount of time the pretreatment "dwells" in the carpet should be less than 15 minutes, due to the thorough carpet brushing common to these "very low moisture" systems, which provides added agitation to ensure the pretreatment works fully through the carpet. Dry carpet cleaning such as Host benefit over wet solutions because dry chemical compounds don't attract dirt like shampoo's do after dried. While dry carpet cleaning is more expensive and more time consuming to clean than Bonnet or extraction, dry cleaning formula's put less stress on the carpets themselves.
Dry compound
A 98% biodegradable or others, slightly moist absorbent cleaning compound may be spread evenly over carpet and brushed or scrubbed in. For small areas, a household hand brush can work such a compound into carpet pile; working like "tiny sponges", the attracted cleaning solution dissolve dirt, dirt and grime is attracted/absorbed to the compound, after a short drying time (the cleaning solution which is attracted to the compound must evaporat), it will be removed with a vacuum cleaner, the drier the better, leaving carpet immediately clean and dry. But its very difficult to remove all residues, the residues can cause allergies and biological compounds may cause discolourations on carpets . For commercial applications, a specially designed cylindrical counter-rotating brushing system is used, without a vacuum cleaner. Machine scrubbing is more typical, in that hand scrubbing generally cleans only the top third of carpet.
Encapsulation
In the 1990s, new polymers began literally encapsulating (crystallizing) soil particles into dry residues on contact, in a process now regarded by the industry as a growing, up-and-coming technology; In the conventional cleaning process surfactant molecules attach themselves to oily soil particles, suspending them (emulsification) so that they can be easily rinsed away. Surfactant (detergent) molecules and emulsified soils which escape being rinsed away, remain in the fibre and continue to attract soiling, causing the condition of the carpet to degenerate; often re-soiling faster than before it was subjected to the cleaning process. Encapsulators are speciality detergent polymers which become part of the detergent system. As drying occurs (20-30 min. drytime), after cleaning, these encapsulators bind the detergent molecules and residual soils in a brittle, crystalline structure. Detergent and soil particles can no longer attract other soils and are easily removed by dry vacuuming. In addition to binding the detergent and soil residues the encapsulation chemistry coats the clean fibre with the same brittle film. This reduces the fibre's affinity for oily and particulate soils. As this brittle film"breaks away" and more soil is removed, the appearance of the fibre improves as opposed to soiling more rapidly. Products which also employ fluorochemical technology, display dramatically extended anti re-soiling time periods. Cleaning solution is applied by rotary machine, brush applicator, or compression sprayer. Dry residue is vacuumable immediately (20-30 min. drytime) , either separately or from a built-in unit of the cleaning-system machine. According to ICS Cleaning Specialist, evidence suggests encapsulation improves carpet appearance, compared to other systems; and it is favorable in terms of high-traffic needs, operator training, equipment expense, and lack of wet residue. Encapsulation carpet cleaning also keeps carpets cleaner for longer periods of time compared to other methods. Encapsulation also avoids the drying time of carpet shampoos, making the carpet immediately available for use.
The use of encapsulation to create a crystalline residue that can be immediately (20-30 min. drytime) vacuumed (as opposed to the residue of wet cleaning systems, which generally requires an additional day before vacuuming) is a newer technology that has recently become an accepted method for commercial and residential deep cleaning.
Bonnet
After club soda mixed with cleaning product, other products are also possible, is deposited onto the surface as mist, a round buffer or "bonnet" scrubs the mixture with rotating motion. This industry machine resembles a floor buffer, with an absorbent spin or oscillating pad that attracts soil and is rinsed or replaced repeatedly. The bonnet method is not strictly dry-cleaning and involves significant drying time. To reduce pile distortion, the absorbent bonnet should be kept well-lubricated with cleaning solution. Its not recommended to dunk the bonnet in a bucket of cleaning solution and then wring it out with a mop-bucket wringer, then the bonnet is to wet. Its very important to change or turn the bonnet early , Bonnets can become filled with soil in just a couple hundred square feet. And once loaded with soil, the bonnet will not hold any more; instead, it simply moves the soil from one area to another. The overly wet bonnet also deposits residues that attract soils when they are dry, creating the need to clean more often. Its recommended for robust and not for high floor carpet, it swirls the floor. It distorts pile and grinds dirt deeper in carpet fiber also it has an abrasive effect. When there is a large amount of foreign material in the carpet, extraction with a wet process may be needed. Normally, the spin-bonnet method may not be as capable of sanitizing carpet fibers due to the lack of hot water, for this a spezial thermo machine is needed, here the buffing machine is equipped with a heating, to heat up the bonnet , but a post-cleaning application of an antimicrobial agent is used to make up for this. Compared to steam cleaning, the small amounts of water required with spin-bonnet carpet cleaning favor water-conservation considerations. It only cleans the top of the carpet 1/8 inch but its very fast for wide areas. But bonnet cleaning is not the best mechanism for completely removing the chemical that is pre-sprayed onto a carpet. Its recommended that only surfactant free or encapsulating products are used. On the other hand the re-soiling is great.
Shampoo
Wet shampoo cleaning with rotary machines, followed by thorough wet vacuuming, was widespread until about the 1970s, but industry perception of shampoo cleaning changed with the advent of encapsulation. Hot-water extraction, also regarded as preferable, had not been introduced either. Wet shampoos were once formulated from coconut oil soaps; wet shampoo residues can be foamy or sticky, and steam cleaning often reveals dirt unextracted by shampoos. Since no rinse is performed, the powerful residue can continue to collect dirt after cleaning, leading to the misconception that carpet cleaning can lead to the carpet getting "dirtier faster" after the cleaning. The best method is to combine shampoo and extraction , first shampoo with a spin brush to loosen the dirt and the pile , then extraction the carpet. But this needs time and double rinsed is necessary and the drying time is up to 24 h.
When wet-shampoo chemistry standards converted from coconut oil soaps to synthetic detergents as a base, the shampoos dried to a powder, and loosened dirt would attach to the powder components, requiring vacuuming by the consumer the day after cleaning.
Dry foam carpet cleaning
Dry foam cleaning involves applying cleaning foam and immediately vacuuming the foam. It is not a completely dry method since the foam is 90% air and 10% liquid. A dry foam machine consists of a pressure tank in which a solution of water and shampoo is added. This method is used for water sensitive carpets, needle felt, and other carpet types whose construction inhibits sufficient water extraction.
Vacuum wash
Vacuum washing employs a washhead that sprays water without detergent and immediately removes it by suction, creating a swirl of water. This ensures high cleaning performance, extracting the dirt from the carpet to a depth of half inch. By immediately reabsorbing the wash water, the drying time greatly shortened. This method is suitable for intermediate and basic cleaning. Because it does not require cleaning products, it leaves no detergent residue. Vacuum washing has long been in use in Europe, mostly in larger train and bus companies, schools, and historic preservation. The system works on all surfaces which are water resistant (carpet, upholstered furniture, wooden floors, stone, plastics). A great advantage is that this system works without brushes or pads so there is no abrasion on pile.
Rotary wash
Rotary wash systems operates with a smooth plastic roller or belt between two opposing contra-rotating roller brushes. A cleaning solution is sprayed through a nozzle into the carpet or presprayed and worked into the carpet with the roller brushes. The action of the brushes and cleaning solution separate the dirt from the carpet fiber. The brushes convey the loosened dirt to the plastic roller or belt which carries it the waste container. The amount of water applied is very low. Rotary wash can be used with all common cleaning agents, though non-surfactant products are recommended. This method also works on floors and is very effective to loosen hard-packed areas.
Dry-Ice blasting
Dry-ice blasting can also be used for carpet cleaning.The Dryice beam blows away the dirt from the carpetfiber without moisture. Is very effective but a bit pricey. it is used for interior cleaning of vehicles .
Household processes
Other household carpet-cleaning processes are much older than industry standardization, and have varying degrees of effectiveness as supplements to the more thorough cleaning methods accepted in the industry.
Vacuum
Vacuum cleaners use air pumps to create partial vacuums to suck up dust and dirt, usually from floors and carpets. Filtering systems or cyclones collect dirt for later disposal. Modern carpet cleaning equipment use rotary vacuum heads and spray jets to deep clean the carpet through hundreds of multi-directional cleaning passes. Some add steam and agitation. Models include upright (dirty-air and clean-air), canister and backpack, wet-dry and pneumatic, and other varieties. Robotic vacuum cleaners have recently become available.
Stain removal
Tea leaves and cut grass were formerly common for floor cleaning, to collect dust from carpets, albeit with risks of stains. Ink was removed with lemon or with oxalic acid and hartshorn; oil with white bread or with pipe clay; grease fats with turpentine; ox gall and naphtha were also general cleaners. Ammonia and chloroform were recommended for acid discoloration. Benzine and alum were suggested for removing insects; diatomaceous earth and material similar to cat litter are still common for removing infestations. Candle wax is removed by placing a towel over the affected carpet area and applying steam from a clothes iron until the wax absorbs into the towel. Some traditional methods of stain removal remain successful and ecological. Caution should be addressed when treating natural fibers such as wool.
The longer the stain material remains in the carpet, the higher the chance of permanent color change, even if all the original stain material is removed. At times pets urinate on the carpet and this results in a bad odor especially when it is hot and humid.The carpet or rug is usually taken outside and immersed in water to remove such stains. Immediately blotting (not rubbing) the stain material as soon as possible will help reduce the chances of permanent color change. Artificial food coloring stains are generally considered permanent stains. These may be removed by professional cleaners or deep cleaning rental machines with heat-transfer stain-reducing chemicals, but carry risks of burning the carpet. Stain removal products can be combined with anti-allergen treatments to kill house dust mites.
Other
Carpet rods, rattan rugbeaters, and carpet-beating machines for beating out dust, and also brooms, brushes, dustpans, and shaking and hanging were all carpet-cleaning methods of the 19th century; brooms particularly carry risks of wear. Steam cleaning increases the lifespan of your carpet.
Misconceptions
Robert Wittkamp (1942-2007), IICRC-certified master Carpet Cleaners technician with 30 years' expertise in carpet cleaning, commented that old wives' tales persist and thrive within the industry. For instance, the concept that walking barefoot on a carpet may lead to damage from body oils has not been supported or disproven by standardized reports or testing or by industry evidence.
References
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