Carpet cleaning methods compared: which suits your carpet?
Hot water extraction, encapsulation, shampoo, bonnet, dry compound and hand washing, explained plainly, along with what suits which fibre.
There is no single best method. There is a best method for your carpet, your room and your schedule. Here is how the main options compare.
At a glance
| Method | Moisture | Typical drying | Depth | Best for |
|---|---|---|---|---|
| Hot water extraction | High | Several hours or more | Deep | Fitted carpet, heavier soil, pet problems |
| Encapsulation | Low | Short | Moderate | Office maintenance, quick turnaround |
| Bonnet or pad | Low | Short | Surface | Interim appearance work |
| Shampoo | Medium | Medium | Moderate | Selected heavy soil, followed by a rinse |
| Dry compound | Very low | Very short | Surface | Moisture-sensitive carpet, light soil |
| Hand or off-site wash | High, in controlled conditions | Depends on the facility | Deep | Hand-knotted and delicate rugs |
Drying times depend heavily on air, carpet and equipment. Treat these as comparisons rather than promises.
Hot water extraction
Often called steam cleaning. Hot water and detergent are rinsed through the pile and vacuumed out. Its strength is that it physically removes soil and residue. Its weakness is moisture, and in Hong Kong's damp weather drying has to be planned.
Encapsulation
A special detergent is worked in with a machine. As it dries, it forms brittle crystals around the soil, which are later vacuumed away. It is quick and low-moisture, so it suits offices with raised floors that must be back in use the next morning. It is less effective on heavy soil, and it does not rinse anything out. It works best with regular vacuuming.
Bonnet cleaning
A spinning absorbent pad buffs the carpet surface. It makes carpet look better quickly, which is useful between deep cleans. It does little for soil lower in the pile, and overuse can distort the fibres or leave dirt deeper in.
Shampooing
The classic foam method. It can lift heavy soil, but residue can make carpet re-soil faster unless it is rinsed out. See carpet shampooing for when it makes sense.
Dry compound
A damp, absorbent powder is brushed into the pile, then vacuumed up. It is useful when water is a concern, but it mainly deals with lighter soil, and the powder must be thoroughly removed.
Off-site rug washing
Suitable rugs can be fully dusted, gently washed, rinsed and dried under control. It is the slowest and usually the most expensive approach, and is often the safest for hand-knotted wool. Read about rug cleaning.
What about "dry cleaning"?
Be careful with this term. "Dry cleaning" is used for several low-moisture methods, including encapsulation and compound. None are truly dry. Ask which process is being used.
Which fibre suits which method?
| Fibre | Generally suitable | Take care with |
|---|---|---|
| Nylon | Extraction, encapsulation | Strong dyes and some stains |
| Polypropylene | Extraction with degreasing | Oily soil and heat |
| Polyester | Extraction | Oily soil, and flattening |
| Wool | Controlled extraction, specialist low-moisture | Heat, strong alkaline products and slow drying |
| Silk, viscose | Specialist only | Water, and most detergents |
Trade guidance on maximum wool temperature varies, and your carpet maker's instructions come first.
How to choose
Ask yourself three questions. How dirty is it? How soon do you need the room back? And how well can it dry? Then ask your cleaner which method they recommend, and why. If you would like an opinion, send us the details.
