I had an old cymbal that looked bad. I looked up various ways to clean it: ketchup, Ajax, pro cleaners... I wondered if the Harbor Freight Headlight cleaner kit would work.
Step 1: Rubbing Compound
I prefer Turtle Wax rubbing compound to the cleanser in the kit. I used a sponge and covered the entire cymbal. I avoided the logo so that it wouldn't get removed.
Step 2: Swirling Time
I attached the cleaning disk to my drill and swirled away. I used Windex all surface cleaner to keep it damp. Then I used the same cleaner and paper towels to remove the residue.
Step 3: Don't Forget the Back Side
Repeat the steps for the back.
Step 4: Finished
This cymbal looked pretty corroded when I started. It took about 3 passes with the rubbing compound until most of the grime was gone.