I had the treble pot on a Princeton Reverb just about seize up. I had already used tuner cleaner many times and was about to give up and just replace it. I was messing around in my garage when I saw a can of Gumout Carburetor Cleaner and said why not, I am going to replace it anyway. I could not believe that on one application the pot let go and worked. I thought the Gumout worked great. The only draw back is the fumes. Has anyone ever tried this? Is it a bad idea?