Dust with a soft dry cloth. Avoid polish or brass cleaner, the patina is part of the sound character and buyers of premium bowls prize it. Fingerprints on polished bowls can be removed with a drop of lemon juice on cotton, wiped dry immediately. Store upright on the included cushion; avoid stacking bowls which can warp the rim. Strike with the mallet on the outside rim (not the inside, which dampens the tone).