Cymbals: inspect edges and centre holes before thinking about polishing
On a cymbal, small cracks at the edge or centre hole matter more than cosmetic shine.
Periodically inspect the edge, bell and hole, and ensure felts, sleeves and stands prevent metal-to-metal contact. During transport, separate cymbals and prevent movement that concentrates loads on their edges.
Cleaning and polishing can alter finish, logos and patina; use methods appropriate to the cymbal type and to the importance you place on cosmetic originality.