I bought some 70% Isoproply alcohol to try and cut the glue off the outside of some wine bottles I had de-labeled for my use at home. The glue laughed at me over that one. What I ended up using, and this may cause some to cringe, was some WD-40 on a old wash cloth. This stuff is amazing!! Totally removed the glue from the outside with hardly any effort. Just thought I would share with others in order to make life easier,and maybe provide a cheaper route to clean that pesky glue. I did go back and clean the outside with the alcohol to get any left over WD-40 and will totally reclean these bottles with oxyclean stuff and bottle brush, followed by san star prior to filling with wine. Hope this help someone with a tiresome chore!