How To Clean Piano Keys Yellow. That said, it does not really get the stink out of keys. Disinfecting your piano keys is a relatively simple job.
If you have a piano keyboard and not a grand or upright piano, here’s how to clean the keys. When dirt is noticeable, dampen a cloth in a dilute solution of a neutral detergent, wring out well, and use this cloth to wipe away the dirt. Also, be careful when you spray anything on your piano, or your piano’s keys.
Disinfect using 3 parts filtered water and 1 part white vinegar.
No matter what cleaning method you choose for your plastic keys, if you have a cover for your keys. With age and use, these old ivory pieces tend to turn yellow. After you’re done cleaning, take dry, soft cloth and wipe the keys again. This system achieves it's effect by using a combination of ultraviolet light, and very strong hydrogen peroxide to bleach the yellow out of ivory.