How do you remove cork tiles with foam stickies?

I hung 12in by 12in cork tiles in my room with the foam stickies that came with the package. I just removed the tiles and tried to scrape the stickies off but they’re stuck! Is there a product that could help loose the adhesive?

The foam stickes are about 2 cm by 2cm and they’re stuck to drywall.

I’ll bet lots of people will suggest "Goo Gone" but old fashioned lighter fluid will work better, and it will be cheaper too. If you have one, use an old credit card as a scraper.