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Before removing the switch, I'd start by spraying between the plastic and metal portions of the exposed part of the switch while still in the car and then twisting/manipulating the plastic piece to break up the expected corrosion.
Nothing to lose --
If you do end up removing the switch, few thoughts
1) disconnect the battery to avoid sparks
2) try to keep the center plastic part of the switch from twisting as you unscrew the outer portion - since the wire's affixed to the back of the switch's center shaft, best to keep it from twisting off while unscrewing the switch.
3) be careful not to let the wire attached to the back of the switch fall back into the hole -- challenging to get back out
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