Ask three cleaners and you'll get three answers, usually the one that matches the machine in their van. Here's an even-handed look at the two main methods, when each makes sense, and why almost every carpet manufacturer's warranty specifies one of them.
Steam cleaning (hot water extraction)
Despite the name, there's no steam involved. Hot water and a cleaning solution are injected into the carpet under pressure, then immediately vacuumed back out along with the dissolved soil. With a truck-mounted unit the water reaches around 120°C and the vacuum is strong enough to leave carpet dry within two to four hours with the aircon on.
- Best for: deep cleaning, stains, pet accidents, allergy sufferers, and anything that hasn't been cleaned in a year or more.
- Pros: removes the most soil by a wide margin, flushes out cleaning residue, kills dust mites and bacteria with heat.
- Cons: some drying time, and a portable machine (rather than truck-mounted) can leave carpet wet for a day or more.
Dry cleaning (dry compound and encapsulation)
A cleaning compound or a polymer solution is worked into the carpet with a rotating brush. It binds to the soil, dries to a crystal, and is vacuumed out — either straight away or over the next few vacuums.
- Best for: light maintenance cleans between deep cleans, commercial carpet that can't be out of action, and situations where it must be dry in under an hour.
- Pros: very fast drying, low water use.
- Cons: it cleans the top of the pile rather than the whole fibre, does little for stains or odour, and some compounds leave residue that attracts soil.
What the manufacturers say
Most major carpet manufacturers specify hot water extraction as the recommended method in their warranty conditions, and several require it at set intervals to keep the warranty valid. Dry methods are generally accepted for interim maintenance but not as a substitute for periodic deep cleaning. If you have a newer carpet, it's worth checking the warranty card.
Drying time on the Sunshine Coast
Humidity is the honest objection to steam cleaning here. The answer is equipment: a truck-mounted machine recovers far more water than a portable one, which is the difference between carpet you can walk on by afternoon and carpet that's still damp at bedtime. We also set up air movers on humid days at no extra cost. If you've had a bad drying experience, it was almost certainly the machine, not the method.
Our verdict
For residential carpet, steam cleaning with truck-mounted equipment is the better result nearly every time, which is why it's what we do. Dry cleaning has a place — a retail floor that needs to reopen in an hour, a light refresh between annual cleans — but it isn't a deep clean, and it shouldn't be priced like one.
By A1 Carpet Cleaning