Belive it or not, you can clean it without removing anything. Remove
the fuse for power windows, or even better, disconnect the battery.
Rock the offending switch in one direction and pry the plastic "rocking"
part off with a screwdriver. I use an Swiss Army knife for this as the
corners are rounded and it doesn't mark the plastic. Then inside you'll
see 2 ball bearings (they may stay in the posts on the rocker removed in
step 1) and 2 contact strips. Remove these 4 bits and clean the
contacts. Clean the contacts now visible on the bottom of the switch.
Replace the contact strips and set the ball bearing down in the center
of them. Note there are springs inside the posts on the rocker, snap
the rocker in place making sure the posts land on top of the ball
bearings.
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