The hot-water extraction method

The machine has two sealed, separate tanks: clean water with the solution added, and recovered water. That separation is not a comfort detail, it is what makes the result verifiable.

1. Dry vacuuming first. Without it, water turns mineral dust into mud and spreads it through the fibre.
2. Injection. The warm solution is driven under pressure through the fibre down to the backing. It swells the soil and breaks its grip.
3. Dwell time. A few seconds only: too short and nothing is released; too long and the textile loads with water for no benefit.
4. Immediate extraction. The same tool vacuums, a few centimetres from the injection point. That tiny offset is what defines the process.
5. Cross passes. A second series at right angles to the first, because pile lying one way does not release what it holds on the other side.
6. An extraction-only pass, without injection, to remove residual water.

You stop when the water returning to the recovery tank is clear.

The product matters less than people think. These three parameters make the difference between a clean textile and a damaged one.

Injection pressure. High enough to reach the base of the fibre, never strong enough to pass through the backing. On the thick foam of a seat, high pressure saturates a core that extraction cannot recover; on tensioned fabric it goes straight through and wets whatever is underneath.

Temperature. Warmth helps release oils and fats. But it is barred on three categories: protein stains, which it coagulates; wool, which it felts; and unstable dyes, whose migration it accelerates.

The recovery rate. This is the percentage of injected water that comes back to the tank. It is the only honest indicator of the quality of a machine and of an operator: whatever is not recovered stays in the textile, along with the soil it was carrying.

Steam alone. Excellent for breaking down a seam, a piping or a contact zone, and for acting on micro-organisms through heat. But steam vacuums nothing: it releases the soil and leaves it there, where it sinks back as the textile dries. We use it as a complement, on targeted areas, never as the main treatment of a seat.

Rotary shampooing. A detergent foam is worked in mechanically and then left to dry. Two structural failings: the soil is not extracted, only redistributed; and the surfactant residue stays in the fibre where it traps dust, so the textile soils faster than before. That is the origin of the famous "it was clean for three weeks".

Dry powder. An absorbent is spread, brushed in and then vacuumed out. Quick, with no drying time, useful as a stopgap on a textile that cannot be wetted. But it works only at the surface, and part of the powder stays at the bottom of the pile.

Hot-water extraction is the only one of the four where the soil actually leaves the textile, and where you can see it with your own eyes in the tank.

Everything else can be put right. Not this.

An over-wetted textile holds water in a layer the air cannot reach: the foam core of a sofa, the base of a rug's pile, the glued backing of a machine-made rug, the frame of a mattress. What follows, over the next few days: a musty smell, a lifted backing where the rug is glued, a browning ring around the area that dried last, and sometimes mould growth.

The three safeguards we apply as a matter of course:

• flow rate matched to the thickness of the substrate, not to the type of machine
• an extraction-only pass at the end of each zone
• air movement during drying on large surfaces

A correctly treated textile is damp to the touch, not wet. That is a criterion you can check yourself at the end of the visit, before signing the checklist. Damp does not mean dry: allow half a day to a full day of drying, sometimes longer, and neither use nor cover the textile until it is completely dry.

No, when the parameters are matched to the substrate. Yes, in four specific situations — and those are exactly the cases where we do not use it:

• Leather and faux leather, where water travels through the seams or does not go in at all: see the limits on sofas.
• Dyed wool whose colours migrate, ruled out by the colourfastness test described on the rug page.
• Tensioned mesh with no retaining thickness, such as a mesh chair back: water passes straight through and cannot be recovered.
• Fragile glued backings, where water would reach the adhesive and lift the backing.

For any delicate fabric — wool, silk, velvet or a fibre of unknown composition — the method is confirmed from your photos before the date. Everything else in soft furnishings — sofa seats and backs, mattresses, tested rugs — takes it perfectly well, and that is what makes it the standard process in the trade.

Black water in the recovery tank is the best immediate proof that work has been done, and it is an argument we use readily. Its scope does, however, need to be drawn honestly.

What it proves: that matter has genuinely been removed from the textile, in quantity, and that it is no longer there. In a market where customers have publicly accused contractors of handing back untouched textiles, that is an immediate and undeniable check.

What it does not prove: that every stain has gone. An irreversible stain remains visible even when the textile has been deeply cleaned, and very dark water may simply indicate a textile that had never been treated before. Some stains, discolouration or smells may persist: no 100% result is guaranteed, and mould needs a diagnosis, since cleaning alone may not be enough.

That is why the final inspection is carried out with you, item by item, on a signed checklist, with a free re-do within 48 hours on any ticked item found not up to standard. The full scope sits on our upholstery cleaning service, and the prices on the upholstery rate page.