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).