Blimey Brad, that looks top! If it is a small bit of paint on the body work try very very small portion of white spirit. I'd personally try a small bit of t-cut.
If you have clayed your car make sure you cleans the paint with a good polish/sealant an then wax. Clay will strip nearly all the protection.
Side skirts looks good - just need the bumpers and your set....give me your cupra r vents...give them!