Most music stores will sell a non-abrasive metal/cymbal cleaner. Pick up a bottle, then pay for it, you little hoodlums! Follow the directions to get some shine back to your tin lids. For stuborn stains, use a toothbrush or other nylon scrubbing implement. No Metal, this will damage your cymbals! You don't want to use anything that will eat at or sratch your prized alloys. Also, don't get too optamistic about returning them to their original glory. Unless your playing brilliant finish
Sabians, there's probably gona be some marks you just can't get off.