Hi! I recently bought a Concertmate MG-1 that appears to have been sitting in someone’s musty basement for a while. When I got it, it was in a suitcase that was moldy and falling apart. I can hear the disintegrated black foam rattling around on the inside, and bits and pieces will occasionally fall out through the keyboard. Also, the knob pots are really dirty and stiff, and some of the switches look a bit rusted. I’m going to open it up and clean it, but before I do, I have a few questions. Once the black foam is removed, should I replace it with some other type of foam? Also, is it possible to clean the knob pots, or should I just replace them with new switches and sliders?