hello everyone

I thaught you lot might be able to help me with my car

I have awhite s2 erst and it has turned kind of a cream colour around the doors and a few other patches, now im sure there must be some way to turn it into a nice shiny white again ? possoble some sort of cutting compund ?

i have no propper poloshing equipment so will need to know what i need and where to get it from

thanks in advance.