Groove Juice!!! To me, Groove Juice is the only way to go. Just spray it on, let it sit, and rinse it off. It's made specifically for cymbals (and maybe other drum parts, I dunno, just know it's made for cymbals) so it isn't really a material-specific cleaner...it's a cymbal-specific. I'm not saying Brasso is bad, but I've heard that it can damage some cymbals. Just regular hardware stuff could damage them too. If you've got good cymbals, don't be risky at all, even if you think it's a dumb risk. You can get Groove Juice at almost any music store that sells drums.
-Kow