When you split the electronic part from the fascia, do it with the unit upside down on a table, that way all the pins won't fall out. Splitting the fascia from the switch housing is the tough bit as you can't see where its clipped in, you need to slip in a small flatblade screwdriver in the "notched" bit of the window switch, between the switch housing and the fascia itself, pushing the screwdriver in from the front of the window switch towards the back. This is the only clip on this side of the fascia so pushing in the screwdriver an inch will release it and allow the switch housing to lift off the fascia. You should reach under at this point and pull both switches as if you're trying to put both windows up otherwise the fascia will pull the switches out of the switch housing.
I think your best option is probably to refurb the fascia. I've seen a few done on here with 147s and also GTs, but can't remember what was used to get the sticky stuff off. The smooth final finish looked good though. Just be careful taking it all apart and make notes/drawings the first time around. And as the poster above me said, don't forget the little Phillips screw before you lift the switch-pack out of the door card.
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