Wipe your cymbals frequently with a soft, dry cloth, and after each practice session or performance. Remove dirt and spills immediately. Clean your cymbals more often with just warm water and soap. If you have to use a cleaner, use a mild, non-abrasive cleaner.
Does cleaning cymbals improve sound?
Before you actually start cleaning, you should consider how you like your cymbals to sound – because yes, cleaning a cymbal can have an effect on it. A cymbal that's either brand new or has been cleaned is going to sound brighter than one that's seen a lot of use (and hasn't been cleaned regularly).