I had to attach a piece of plastic 1 inch thick to a shoe sole to make it 1 inch taller. Why is not relevant.
After using this frankenshoe for 2 months I no longer need it, but the shoe sole is sticky.
I used isopropyl alcohol to rub it and removed a bit of junk, but part of the surface is still sticky. I applied more isopropyl and let it act for an hour. Still sticky.
What works for you?
Search for “Hexamethyldisiloxane adhesive remover”. It’s designed for removing ostomy bags but it will remove pretty much any gummy sticky glue from anything with very little effort.