I put some DeOxit on the pot of my 106 which started the rustling sounds about a week after I got it. It was gone afterwards, but in a couple of weeks was back, just like before. A lot of work for a very minor problem. Unless the pots in my 106 and PSR-500 actually fail, let them scratch away.
Pro-2004, 2005, 96, 106, 197, PSR 500. Kenwood R1000, TS-850SAT. JRC NRD-525, Allied SX 190 (2, one works 100%), Yaesu FRG-7(2), Hammarlund HQ-100, Icom R71A (2), a few old CBs.