Remove hard amber glue from tile and bathtub?
It looks like an Epoxy adhesive. Chipping away is okay if your careful. But, try a single sided razor blade. A lot of the time you get right under it &amp; almost peel it off. You can also lightly hammer these types of razor blades. Holding it with gloves or with pliers.

You'll also want the razor blade to actually scrape or peel any residue away after the bulk is off. I'm not sure if nail polish remover, turpentine, minerals spirits or acetone would do much in the bulk removal, but any of those would be great for the final clean up.