A few years ago I bought a CJ preamp with a silver faceplate that was stained.
I called CJ and the service tech said that they used Cinch brand liquid cleaner which is available at the grocery store. Since then I have cleaned all my metal gear regularly and had no problems at all with any side effects.
I called CJ and the service tech said that they used Cinch brand liquid cleaner which is available at the grocery store. Since then I have cleaned all my metal gear regularly and had no problems at all with any side effects.