They wont polish out, the clearcote is too hard on the roof. Ive tried it on a chip on my roof with my Porter Cable and it had no effect. Sayemthree's suggestion is your only option.
Im just going to leave mine. As QShip says, it makes sod all difference come time to sell. I spent hours and hours keeping my previous car, a modified V6 TT, in better than showroom condition (and lots of cash) and it made sod all difference when I sold it. Now I dont have the time and you know what, with half the time and half the effort people still comment on how clean my car always is (helps with it being white and bright so the eye cannot focus on blemishes).
E92 M3, Breyton GTS 19s, black and carbon all over
Factory Mini John Cooper Works 211bhp
MK Indy R track car (road legal) 300bhp+ per ton, sequential box
VW Tiguan 4x4