My TV remote control has been a bit hit and miss. Sometimes it works and sometimes it doesn't. I took it apart and cleaned it as follows:
ONE I carefully wiped some gunky residue (food? drink?) from inside using tap water on a paper cloth to dissolve it. That included:
(a) the rear of the one-piece rubber keypad (b) the part of the circuit board containing the key contacts
Maybe I should have used distilled water but I made sure I wiped the water off until it was almost completely dry.
TWO I then used isopropyl to remove any oils or grease residues on (a) and (b) above.
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I have read here:
Is water or alcohol likely to remove the coating that page refers to?
Is it completely crazy to very LIGHTLY sandpaper the contacts on the board? I would using 1,000 grit or even the soft "flour" paper usd to finish off varnishes on furniture. The contacts look like some sort of carbon and might take two or three very GENTLE strokes.