Recently I did a project and needed to remove the sticky glue from plastic bottles. I tried soaking them in alcohol, but that didn't work. I tried lotion (this works with spray adhesive when it is on your hands). I finally tried some plain dish soap and Oxiclean. None of these helped at all.
I did not want to mar the surface so I took some WD40 and a soft cloth. I put the WD40 on the cloth, and gently rubbed until all the sticky glue was gone. I then washed my bottles and dried them to use for my craft.