Bought a used service vehicle that had decals: decals gone but paint gloss still shows decal outline

[allenk4]

OP...Is the vehicle white?

If so, a cleaner wax might do the trick.

Try Meguiar's Black Wax. Sound counter intuitive, but the Black Wax verison has more abrasives in it than the White Wax version (according to Megs)

Could save you a lot of work.

 

[statusdetailing]

It's called ghosting and is sometimes impossible to fix. Paint correction will help and most likely will 100% correct the problem. The issue is that sometimes the base coat will fade underneath the clear. The is nothing you can do about it without repainting if this is the case.