Use goo-gone mixed with vinegar and a little tiny bit of vodka. Be sure not to use too much vodka or it will smell like straight alcohol. I would suggest mixing it and applying it outdoors just to be safe (so you dont mess up the floor). Soak it with the solution and let it sit for about 24 -48 hours until it dries. Once it dries apply a little bit more of the solution. After it is slightly damp set that shit on fire and buy a new one.