Painted Graffiti On Vinyl Window Wrap

Hey guys and gals. A customer reached out for some help. They have a storefront client who has a vinyl wrap on their windows that has been tagged up with some paint graffiti. Any suggestions what may help remove the paint without damaging the vinyl?

I don’t have any clue on this one. Thanks

Tough one…smart graffiti if its available in the states might work but not sure how the vinyl would react to it.

Biosolv?