[COLOR="Olive"]Goo Gone is good stuff, indeed.
Now, the discoloration...you can get some Wright's Copper Cream and do a few runs over it with that. Remember not to rub it in too hard (and remember to wet the cymbal first) because it can abrade just a tad if too much elbow grease is used. let the cream sit there for a minute and let it do its work. then rinse off the cymbal and wash with a mild dishsoap or biodegradable detergent soap.
Also keep in mind that, along with the green coming off, it will take off some of the rest of the patina which may be on the cymbal. It usually takes 3-5 runs of the stuff to remove ALL patina....but it will take off some with each application.[/COLOR]
[COLOR="Gray"]BTW...if you still have 'em all...the 20" is worth about $120-150, and the 16" is worth between $75-100, depending on the weights....except if they are riveted per your pics, knock off about $15-20 per cymbal.[/COLOR]