Gasket removal
At worst use a 600>800 wet sanding but make sure you do not spend too much time in one area.
I use plastic craper and brake cleaner with tons of coarser cloth (old jeans Denim), all of that while holding a shop vac tube close to scraping area, to suck everything in order not to drop debris in water holes.
MEK is methyl ethyl ketone and can be purchased at Home Depot. Just wear gloves when using.



