This Polyshine anti-static cloth removes dust, smears, grease and fingerprints from all polyester surfaces. Many people think cleaning a piano with a standard cloth or duster is fine, but in reality you will find that as soon as you finish dusting, the static attracts more dust almost immediately after cleaning. Other cloths can also damage your piano. The cloths don't pick up the dust, instead they just move the dust around the piano. The polyshine cloth has truly amazing performance and can be washed.