Large pieces of furniture gather a particular kind of dirt, and the cloth laid over them takes all of it. A cover on a broad polished surface is doing several jobs at once. It intercepts falling dust, it stops small objects sliding and tapping, and its soft underside keeps hard things away from a hard surface. Each of those jobs leaves a trace. Over a season the cloth goes duller from above, develops a faded band wherever light reaches it, and slowly changes shape, because the two layers it is made of do not behave the same way once they are wet.
The Two Layers of a Cover
A piano cover is usually built from two quite different materials, bonded or stitched together along the edges. The face is a woven cloth, often a heavy cotton, a wool blend or a plush with a short pile. The back is something soft and not woven at all, and in older pieces that almost always means felt.
Felt is not a weave. It has no yarns running in any direction. It is a mat of loose fiber compressed until the individual fibers hook into one another and hold together as a single sheet. Wool does this naturally, because each wool fiber is covered in microscopic scales that ratchet past their neighbors and then lock in place.
The method for making wool felt is agitation in warm water. Loose fiber is wetted, worked, pressed and worked again until the sheet tightens and thickens into something that holds together without a single stitch in it. That account is worth sitting with for a moment, because it is also a fair summary of what a wash cycle does.
Newer covers often use a bonded synthetic fleece or a brushed polyester knit instead, which does not felt and is far more stable in water. The two look similar enough from above. The difference only announces itself once the piece is wet, which is why it is worth looking at the underside before anything else is decided.
Why Felt Reacts Badly to a Wash
A wool felt backing in warm water with movement around it simply keeps doing what it was made to do. The fibers migrate a little further, hook a little tighter, and the whole sheet draws itself in. It becomes smaller, thicker and harder. No step reverses this, because nothing can unhook the scales once they have engaged.
Shrinkage of a few percent would be tolerable by itself. The trouble is that the face cloth shrinks by a different amount, usually much less, and the two layers are joined to each other. One layer pulling in harder than the other turns a flat panel into a cupped one, with ripples around the edges and a hollow through the middle.
That distortion is mechanical rather than a crease, so pressing does not take it out. The felt is genuinely shorter than the cloth attached to it, and it will stay shorter. The cover sits unevenly from then on, lifting at the corners and bulging wherever the two layers are pulling against one another.
Cool water and very little movement reduce the risk without removing it, because felting responds to agitation more than it responds to temperature. If the backing is wool, washing the piece is a real decision rather than a routine one. If the backing is a synthetic fleece, the decision is a good deal easier.
The Dust a Flat Cloth Holds
Indoor dust is not simply fine soil. Most of it is fiber broken off textiles and paper, mixed with a mineral fraction tracked in from outdoors and a surprising quantity of oily aerosol. Cooking puts a fine film of fat into the air of a whole house, and the soot from a burning wick is carbon suspended in an oily carrier.
The oily portion is why dust sticks instead of blowing off, and it is why a cover goes gradually gray rather than merely dusty. Particles land, the film holds them, more particles land and bind to the first layer. Shaking the cloth outdoors takes away the loose top and leaves the bound layer exactly where it was.
A large horizontal cloth gathers far more of this than a vertical one, because gravity is working in its favor all day long. It also gathers it evenly, which disguises the whole process. There is no obvious dirty patch to notice, just a complete panel that is half a shade duller than it was a year ago.
Furniture polish adds a layer of its own. Polishes are generally wax or oil carried in a solvent, and overspray settles onto any cloth nearby. That residue is tacky, holds dust more firmly than the original film did, and needs warm water and surfactant to come away rather than a rinse.
What Window Light Does
A cover on a broad surface near a window takes a great deal of directional light. Sunlight breaks chemical bonds in dye and in fiber alike, and that damage accumulates and does not reverse. Dye fades first because its molecules are the most vulnerable, and different dyes within the same mixture fade at different rates.
Uneven fading is why a faded navy reads brown or purple rather than pale navy. The component that gave the color its depth has gone, and what is left is not the part you were originally looking at. Nothing in a wash puts those molecules back together again.
The pattern is usually a sharp band rather than a general dullness, because light arrives from one angle and objects on the surface cast hard shadows. A cover can have its exposed strip two shades lighter than the part that sat under a lamp base, with a clean line running between the two.
Fiber damage runs alongside the color change and matters more over the long run. Wool and silk yellow and lose tensile strength under light, while cotton loses strength without much yellowing. A cloth that has been in bright light for years can tear along the faded band under very little load, including the load of being washed.
Storage, Folds and the Line They Leave
Covers get folded and put away when a room is rearranged or the season turns, and a fold held for months is a different thing from a fold held overnight. Fiber at the crease is bent sharply, and over time the internal bonds reform in that bent position until the crease is a feature of the cloth rather than a temporary shape.
On a wool face the crease sets hard. On a pile face the fibers along the fold lean the wrong way, and that line reads as a stripe of different color even after the crease itself has relaxed. On a felt backing the fold compresses the mat permanently, so the backing is measurably thinner along the line.
Light makes the storage problem worse in combination with it. A cover folded with one face outward and left where light reaches it fades in strips, and when it is opened out the pattern of the folds is printed across it in tone. Rolling it around something broad instead avoids a sharp bend anywhere along its length.
Dust that goes into storage goes in with the cloth. Any oily film still present keeps reacting with air through the months, and the mark it leaves is yellower and more fixed coming out than it was going in. A cover washed before it is put away comes back out looking much closer to how it went in.
Furniture Covers in Raleigh Homes
Damp air is the main local consideration. When indoor humidity runs high for weeks together, a thick felt backing holds moisture against a polished surface and gives it up very slowly, because felt is dense and has no open structure for air to pass through. A cover washed and then not dried right through its backing is the usual version of that problem.
Seasonal temperature swings matter as well. Wood moves with humidity and a cloth laid over it does not, so a cover that fitted neatly in one season can sit slightly differently in the next. That is the furniture changing rather than the fabric, and it is worth knowing before anyone concludes that the cloth shrank.
Light in Raleigh is strong enough through the brighter half of the year to fade an exposed strip within a couple of seasons. The practical consequence is that such a cloth often needs replacing because of a faded band long before it has worn through anywhere, and turning it end for end now and then spreads that exposure out.
Drying a Thick Backing
The hard part with any thickly backed cover is not the washing. It is getting the water back out of the backing without prolonged heat that would harden those fibers further. Thickness is the whole issue, and a dense panel needs airflow and volume around it rather than a long run at high temperature.
The machines at our self-service laundry on North Raleigh Boulevard include drums with the volume to let a large panel open out and turn over properly, plus extraction that pulls most of the water from a dense backing before any drying begins, which is the step that decides how a thick cover finishes.
Our machines and the store are cleaned daily.
Nou wash-dry-fold service covers the everyday laundry.
For general guidance, The American Cleaning Institute publishes a fabric care guide that is a useful cross-check.
The short version
A piano cover is usually two bonded layers, a woven face and a soft backing. If that backing is wool felt, warm water and movement continue the process that made it, so it shrinks, thickens and pulls the face into ripples. Indoor dust is partly oily, which is why it binds rather than shaking off and why the cloth dulls evenly across the panel. Window light fades an exposed band and weakens the fiber there.
WaveMAX Raleigh is at 1100 North Raleigh Blvd, easy to reach from Raleigh and the surrounding area. If you have a load that will not fit at home, call us at 919-301-8054.