If you use chemical cleaners (including the stuff sold by cymbal manufacturers) it will remove a tiny amount of metal each time you use it - but the amount of metal removed is insignificant and you will have to clean them for a long, long time to make any appreciable difference. Most of that black gunk that comes off your cymbal isn't really metal - it is corrosion, sweat, beer and accumulated dust and grime. Some metal may be removed - but the amount is insignificant.
Try cleaning and already clean cymbal and weighing it before and after - you will need really accurate scales to find any difference - if any.
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