I had an old home cinema amp with a finicky encoder. The only thing I did was to remove the knob, douse the encoder in contact cleaner and put the knob back. I

I had an old home cinema amp with a finicky encoder. The only thing I did was to remove the knob, douse the encoder in contact cleaner and put the knob back. I didn't even open the case. It took a few times to get it back to fully working but in the end, it worked surprisingly well, and it seems to last. Replacing the part is obviously better, but contact cleaner can do wonders if you want to try a cheap and dirty solution. Note: I used the 3-in-1 (WD-40) brand because it is what they have in my local hardware store. I suppose that DeOxit and other brands work just as well if not better.