Iconic red suede Gucci horse but loafers 9 1/2 AA worn in so pls look at photos

These are fun but I just don’t wear them. Bought from TheRealReal and they were clearly worn a lot by that person, and I don’t blame them: once you get them on (with the shoe horn of course!), they’re super comfortable. I only wore them once. I’m a true 9 There is something on the bottom of one (it’s white). I started to remove but I think I need one of those goo be gone things, to remove without damaging anything