If you’re still stuck in a drifting pickle, you’ll need to get a few supplies, namely these: Small Phillips Head Screwdriver (long-necked) Compressed Air Contact Cleaner You’ll need to disassemble the Pro Controller to a degree in order to effectively clean it, as unlike the Joy-Con ...
Once you can get something out of the outer case, there's no need to disassemble it further. It's best to take out all of the keys and big, loose items so they don't get broken and the plastic shavings you'll make by cutting the case can be vacuumed away, but anything small ...