I have seen a really persistent problem like that only once in the years I worked in a body shop. It was on the flat black stripes on the hood of a late 70's Firebird Formula. The owner had been applying Armor-All to them. Sanding didn't help, wiping with prep-solvent (Kril-Kleen) didn't help, and wiping with lacquer thinner didn't even work.

What finally worked is a product called PolyCracker. It sprays on like water and a quick wipe down later the problem was gone.