How to Clean Piano Keys — Plastic and Ivory — Without Hurting Them

The whole method fits in a sentence: a soft cloth, barely dampened with water and a drop of mild dish soap, wiped front-to-back one key at a time, then dried immediately. That's it — that's the professional technique. Everything else worth knowing about key cleaning is what not to do, how ivory changes the rules, and which jobs belong to a technician. Ninety seconds of reading, a lifetime of clean keys.

The method, properly spelled out

1. Wring the cloth nearly dry. Damp, not wet — the enemy is water running down the sides of the keys, where it swells the wood beneath and feeds the sticky-key problem you were trying to avoid.
2. Wipe front-to-back, not side to side — sideways pushes grime (and moisture) into the gaps between keys.
3. One section at a time, dry as you go with a second cloth.
4. Sharps too — the black keys shed dye when cheap or old, so give them their own cloth pass and don't be alarmed by a faint grey on the cloth the first time.
5. Frequency: whenever they look or feel like they need it. Hand oils are mildly acidic and dust is mildly abrasive; a household with daily players benefits from a monthly wipe.

Never: spray anything directly at the keyboard (sprays run into gaps — always cloth first), household cleaners, disinfectant wipes with bleach or strong alcohol (they haze and embrittle plastics and ruin ivory), furniture polish (slippery keys are a genuinely bad time), or vinegar (acid on ivory is a chemistry demonstration you don't want). If a stronger disinfecting pass matters to you — piano teachers, we see you — a cloth lightly dampened with diluted 70% isopropyl, used sparingly and dried at once, is the accepted compromise on plastic keys. On ivory, water and mild soap only, ever.

First, know what your keys are

Plastic (nearly everything built after the 1960s–70s): uniform bright white, seamless tops, slightly glossy, faintly warm to the touch. Sturdy, water-tolerant within the rules above.

Ivory (many pianos before mid-century): each key top is two or three thin pieces — look for a fine seam line across the key about two-thirds back — with a subtle grain like fingerprint whorls, a matte silk feel, and a coolness under the finger. Ivory is porous, which drives every special rule: minimal moisture, no chemicals, and no soaking ever.

Not sure? Angle the key in raking light and hunt the seam. Or ask at your next tuning — identifying key tops takes us seconds, and it's worth knowing before you clean or sell.

The yellowing question, answered honestly

Plastic keys yellow from age, oils, and UV exposure. Gentle cleaning lifts the grime portion; the age-yellowing portion is in the plastic and doesn't wipe off. Live with it (it harms nothing), or a technician can polish key tops — genuine restoration is replacement key tops, a routine and reasonably priced job that transforms an old keyboard's face.

Ivory yellows as a natural property — and here's the pleasing twist: light slows it. Unlike plastic, ivory kept in gentle daylight stays whiter; ivory locked under a closed fallboard for decades goes deep cream. So the old advice stands: leave the fallboard open in a room with indirect light (never direct sun — that's a placement sin for other reasons). Deeply yellowed ivory can be professionally cleaned and lightly resurfaced; the DIY bleaching recipes on the internet — lemon, peroxide pastes, sunlight-plus-chemicals — damage more keyboards than they whiten.

One more ivory note: chipped or lifting ivory key tops are glued and patched by technicians, and missing ones can often be matched from salvaged stock. Don't reach for the household glue — the fix for a lifted ivory is minutes with the right adhesive and a disaster with the wrong one.

While you're at it — the rest of the piano

Case: soft dry or barely-damp cloth, and nothing from the furniture-polish aisle on modern finishes. Inside: not yours — dust on the soundboard and between strings is a technician's vacuum-and-brush job at service time, because everything in there is precisely adjusted and lightly attached. The full owner's routine lives in caring for your piano between tunings.

Common questions

Can I use Clorox or Lysol wipes on piano keys?
No — bleach and harsh disinfectants haze plastic and destroy ivory. For disinfection on plastic keys, a cloth lightly dampened with diluted isopropyl, dried immediately, is the safe ceiling. Ivory gets soap-and-water only.

How do I whiten yellowed piano keys?
Plastic: cleaning removes grime-yellow; age-yellow needs polishing or new key tops. Ivory: professional cleaning and light resurfacing — skip the DIY bleaches, and going forward let the keyboard see indirect daylight, which naturally slows ivory's yellowing.

Are ivory piano keys valuable?
Not monetarily — ivory can't be legally traded in most circumstances, and it adds no resale value. Its worth is originality: on a fine old instrument, intact ivory is a preservation point, worth cleaning gently and keeping.