WD-40 is not petrochemicals. It is vegetable based.I usually try to remove as much of the old adhesive as I can with my bare fingers, I don't mind a little manual labor.
I'm not a fan of using anything with lots of petrochemicals when a less toxic solution can be found, so I usually start with isopropyl alcohol. If that doesn't cut the goo, mineral spirits or goo gone are next in line.
I stand corrected. Looks like I was a victim of an urban legend that isn't correct. I had read on the whirledwildweb it was fish oil based.Here's an excerpt from the WD-40 Material Safety Data Sheet -
Aliphatic Hydrocarbon
Petroleum Base Oil65
LVP Aliphatic Hydrocarbon
Surfactant Proprietary
Its loaded with petrochemicals.