Wool Rugs and Synthetic Rugs Are Not Cleaned the Same

How to tell what you have without a label

Most rugs that reach us have no tag left, or they have a tag that only says the country. 3 checks get you most of the way there.

Look at the back. On a hand-knotted wool rug the pattern reads on the reverse almost as clearly as on the face, because the design is in the knots themselves. On a machine-made synthetic the back is usually flat, gridded and often has a latex or canvas backing glued to it.

Feel it with the back of your hand. Wool has body and springs back when you crush a tuft. Polypropylene feels slick and a little cold, and a crushed spot stays crushed.

Pull one fibre from a hidden edge and burn it with a lighter over a sink. Wool chars, smells like burning hair and crumbles to a brittle ash you can crush between two fingers. Nylon and polyester melt into a hard bead and smell like a chemical rather than hair. That single test settles it, and it is the one we do on a pickup when the fibre is not obvious.

Viscose is the nasty case in the middle. It is sold as art silk or bamboo silk, it looks like silk, and it loses most of its strength when it is wet. A viscose rug is not a thing to experiment on.

What heat and alkalinity do to wool

Hot water extraction at the temperature a truck mount puts out is a normal day on a nylon carpet. On wool it is a risk, because heat plus moisture plus agitation is the recipe for felting, which is the scales on the fibre locking together. Felting cannot be reversed. The rug comes back smaller and denser and the pattern distorts.

Alkalinity is the other half. A lot of carpet prespray sits well up the pH scale, which is fine on plastic and which on wool strips the natural oil out of the fibre and leaves it dull, dry and more prone to soiling again. Wool wants to be cleaned near neutral, worked cool at around pH 7, and rinsed properly rather than left wet and loaded with product.

Drying is the step people underrate. A synthetic rug sheds water. Wool holds it, and a wool rug left damp through a humid Ocean County week will smell before it dries. That is one of the main reasons some rugs leave the house rather than get cleaned where they lie.

Dye bleed, and when it is recoverable

Older hand-made rugs are frequently dyed with colours that were never fully set, and red is the usual offender. The test is simple: a white towel, a damp corner, and 30 seconds of firm pressure. If colour transfers to the towel, that rug cannot be flooded with water on your living room floor and hoped for.

Bleed caught wet is often recoverable. Bleed that has dried into the surrounding wool is a different and much longer job, and it is not something that gets fixed with a household spot cleaner. If a pet accident or a spill has already run on a wool rug, the useful thing is to blot, stop, and call before anything else goes on it. Half the rugs we cannot fully recover arrived after somebody had already applied a supermarket product to a bleeding dye.

Which rugs should not be cleaned in the house

A synthetic area rug in a normal condition is usually fine to clean in place, on the floor, the same visit as the wall to wall. That is the straightforward case.

A wool or a hand-knotted rug with real soil in it is not, and the reason is dry soil. Years of grit works down to the base of the pile and sits on the foundation where a vacuum cannot reach it. Most of what makes an old rug look tired is that dry grit, and it comes out mechanically before any water is involved, which is not something that can happen on your floor. Add a fringe that needs its own treatment, a dye that moves, and a fibre that has to be dried flat and fast enough that it is not still damp 48 hours later, and the honest answer is that the rug leaves and comes back.

We tell people which case theirs is before anything is booked. Sometimes it means a smaller job than the one that was expected, and we would rather say that than shrink somebody's rug.