So I bought some gravity boots at a yard sale, they let you hang

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So I bought some gravity boots at a yard sale, they let you hang upside down from a pull-up bar. I thought they seemed fine but later when I got home I found that the foam pads were coming loose from the plastic housing, see the picture I've attached, those are the ones that I have. Apparently the adhesive that attaches the foam pads to the gravity boot plastic housing has melted, I think they were left in a car trunk on a very hot day or something to a similar effect and now the back of the foam and the inside of the plastic housing have this horribly sticky residue all over the inside of the gravity boots and foam pads. I tried spraying it with a fuck ton of goo be gone, I mean completely drenched it and let it sit for 3 days, hoping by then the goo be gone would have dissolved the entire sticky residue. After the 3 days the goo was marginally better at best, there is still a lot of it left. I'm basically handling them in a wash basin sink while wearing latex gloves and safety glasses because this stuff is just that sticky I don't want any of it on me.

My question is this, do you guys know of anything way stronger than goo be gone that I could soak this stuff in, tie in a plastic bag and let it dissolve all of the sticky goo? If I can't find something to clean this up I basically have to throw away these gravity boots. Thank you for taking the time to read this and possibly help me out with my problem.