Hi Pawg,
I hope the stain you see is grime and not warped paint.
I know, they egged my car last year and it warped my
clear coat. I put chrome lettering over it as it was on the side.
Looks OK.
If you try all sorts of polishes and cleansers and your
paint still looks like it's wobbled then it's warped.
Hope it works out OK.
rd