All of the suggestions I made assume removal of the switch from the door. There should be no electrical connections in place when dunking the switch in the isopropyl alcohol. Even with the switch removed, acetone is not a good idea. The odds are not in your favor if you try to disassemble that critter. Has little roller ball contacts, springs, etc, inside. Try treating with the witch's brew I suggested. If that doesn't help, then it is NG or there is something else wrong. Did I mention checking the fuses???

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.