How to remove acrylic wallpaper seam sealer from painted drywall?

Try goo be gone.

Hi Bruce, have you tried mineral spirits or REALLY hot water?

Tried to research it for you https://www.justanswer.com/home-improvement/000pi-removing-old-wallpaper-unable-remove-seam-sealer-glue-wa.html really not much help someone suggested Goof Off. May just need to sand it off then repaint the drywall. Could try these. Zinsser "Dif Gel" or Roman's "Strip Plus" are both gel strippers

What I do is get a garden sprayer & put steaming hot water in it, then spray the wall in a small area's, really I soak it ahead of myself in sections about a 3 to 5 minute ahead of time. I then scrape the wall with a 10 inch mud blade or if you don't have that, a 5 inch mud knife. It gets pretty gooey and I also have a five gallon bucket of hot water also with a big sponge to slowly dissolve the rest off the wall.Ring the sponge out a little. Be careful not to damage the wall to badly with the mud blade or knife & if it is sheet rock underneath, be very carful not to rub so hard to take the paper off. If you do have a little damage, use ready made mud or spackling to repair sheetrock & let dry. I repeat let dry first. Then slightly sand. Also you can also slightly sand the whole wall to make ready for what ever is next, & I do mean slightly after the wall has dried. PS If you don't have a bug sprayer just use the five gallon bucket & the big sponge, & be careful not to burn your self with the hot water, being it does have to be pretty hot. You can use rubber dish washing gloves to help that. Best wishes

This may be more trouble than it's worth, but WD40 sprayed on & let sit for a few hours. May leave a greased stain that can't be painted over!

Have you tried Surgical Spirit or WD-40 nail varnish remover?