Not sure if anyone else has tried this, but I suppose you could try
spraying some electrical contact cleaner into the mute switch from the
outside if you’re that opposed to opening it up. Just make sure you pour
out the excess and allow for enough ti...
Just did this myself and it seems to have worked beautifully! I used
WD-40 Specialist Contact Cleaner…only did 1 spray on all 4 sides of the
mute switch mechanism after opening up the bottom cover.
