Told ya an old 22" A Ride was worth the journey! Congrats dude!
Don't worry about cleaning it, if it's survived this long a bit of tlc will do it the world of good!
Some idiot had put gaffer tape on the top of mine and the residue must have been 30 years old. Had to pressure wash it off......last resort.
Get some mild cymbal cleaner like the Paiste one and get to work with the elbow grease, you'll slowly see it come back to life.
Zildjians age really well, you'll get a nice dulled shine.