hahahahaha.....Now this is a real pain in the arse job!
I did mine and removed all the rubber coating.
the best way is to use thinners on a rag and wipe over the rubber coating to make it soft and wrinkle, but rub straight off, So that the thinners doesn't affect the plastic underneath.
and use a coil or wooden wedge (I used my fingernails) to remove the soft rubber.
Just do small sections at a time, it will take a bit of time to do!
when rubber is removed and plastic is cleaned (use prepsol) , then plastic prime the parts and then paint!
enjoy!