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You have already diagnosed the problem. The contact inside the switch will corrode over time and needs to be cleaned. Pull out the switch and take it to a workbench if it unplugs.
Pop out the black plastic toggle. Be careful, there is a small spring holding down a ball bearing against the contact strip. Clean off the contact strip and put it back. Put a little grease on the plastic bearing holder to hold the bearing in place, and re-insert the plastic toggle.
Repeat for the other side of the car, it is going bad too.
Klaus
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98 V70Rawd(108Kmi), 95 854T(88K mi), 75 164E(173K mi)
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