Loosen one edge and pull the patch away from the shoe. If you have any difficulty, gently warm it with a hair dryer to loosen the adhesive ever so slightly. If any adhesive remains on your shoe/insole, standard white vinegar can be used to loosen it so it releases from fabric and leather shoe linings. All it takes is a little vinegar soaked on a cloth that’s rubbed onto the adhesive residue. After about two minutes, the adhesive should almost release in one piece. Any residual adhesive can be scraped with a fingernail or dull utensil. Let the surface dry completely, then apply a new patch. There’s no need to clean the shoe lining further, since the vinegar dries quickly and doesn’t leave any oily residue behind.