I was going through a old sansui 20 year + old receiver for a customer the other day and ran across the usual dirty switches. some i could take apart and clean and burnish the surfaces. Thought i had it whipped when it started to crap out a channel again. Turned out to be the selector/tape monitor multi layer wafer switches. I trying the usual suspects and could not get the crud off. Tried acetone, alcohol, PC board degreaser, caig, and my old favorite GC red concentate (think its long NLA). This crud would just not come off. I could get a Q tip partially down into the open wafer switches. I decided to do something a little radical. I dipped the Q tips in concentate, then dipped the Q tips into some ajax scouring sink cleaner (not much mind you). With a little scrubbing, the 20 year oxidation scrubbed off! I then washed it off with spray degreaser. Let it dry then sprayed Caig pro gold on them. It seemed to do the trick. I was a little hesitant to use the ajax, but it did not seem to do any major damage.
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