cleaning Mac amplifier?

I am looking to maintain a well cared for mc-250 amplifier. The chrome, paint, and print are currently in good condition. What products work well to prevent pitting while not harming the print?
Thank You for your help.
I have 3 of these amps, one of which I bought new years ago. Use white vinegar with a soft cotton cloth. This cleans and shines and won't remove print or cause scratches.
I have used simple rubbing alcohol and a cotton cloth with good results. Make sure the cloth is 100 cotton since polyester blends can cause scratches.
Alcohol can remove the lettering.