The most common way to loosen glue is to use acetone, which is an organic compound found in many nail polish removers. Acetone is a solvent and can be used to loosen glue or remove any adhesive residue. The makers of Super Glue recommend using hot water to loosen glue.
Acetone can damage or discolor some surfaces, so test it on an inconspicuous spot to check for damage or discoloration. Hot water is the safer option in situations where damage may occur. Remove glue residue on skin with hot soapy water. Acetone is a skin irritant, and exposure to the skin, eye, or nose should be avoided.