yeah just wipe it with thinners , its will just get rid of all the muck and grime thats ontop of the standard rubberised ford stuff, no point in taking all the standard ford stuff off its done a good job so far

thats what im having to do with mine and its a pain in the fooking arse.
have a look at this pic.

you could stonechip it all but thats totally up to you, i would just give it a couple of coats of zinc etch primer, couple of coats of body colour then 2 or 3 coats of laquer. sorted.

hope this helps