On my Perazzis I disassemble, thoroughly clean with acetone, and spray a couple heavy coats of Rustoleum clear poly. That will get it as clean as it's going to get with zero damage, and protect it better than any lacquer on the planet. I do it every 2-3 years on the ones used all the time. Colors have not degraded beyond what might have transpired before I got them.
The oldest is an early 70's gun and I've had it 30years or so. Colors were not too good then but are no worse now and it was out with me every week for nearly 25years.
