Autosol. Awesome stuff.
Autoglym metal polish is really good stuff. Shocked the hell out of me anyway..
My charge pipe was a dull grey metal.. Some of the AG Metal polish and a scouring pad = Almost chrome!
I've used both Autosol and AutoGlym quite a bit.
Found AutoGlyn to be best the Scoob and the pipes were needing some effort!
Oops :0
PC might be a shout for Dean if it's really bad.
i only sanded the texture off. once it was smooth. the rest was done with elbow grease.That stuff good working by hand though as i dont have none of your fancy air sanders lol !