1) Lose adhesion 2) Remove adhesive 3) Use an acetone-based solvent 4) Use debonder 
• (v. t.) To separate, part, or open, as anything fastened with glue.
to separate or detach by or as if by overcoming an adhesive agent: to unglue a sticker from a wall. · He was unglued by his opponent's superb defense. · to confuse or upset:He was unglued by his opponent's superb defense. · to cause to fail or lose effectiveness.