How To Clean Piano Keys Safely. Gently wipe down the keys in a linear motion without scrubbing. Before using piano wax or polish, consult with the store where you purchased the piano, or a specialty piano store.
You need to prepare the liquid you will use to clean the keys. These sprays are fine for around the house, but like other chemicals, they can cause more damage than good. Dampen a cotton pad with hydrogen peroxide and use the pad to wipe down the piano keytops (back to front) between players.
Follow the cleaning method to disinfect each key of your piano.
If they're plastic, rub them with a chamois cloth dipped in vinegar mixed with warm water. The cloth should only be damp and cover an area the size of your fingertip. Well overdue for a clean. Avoid colored cloths that may bleed when moistened.