White NikeCourt Vapor Lite size 8.5.

Purchased these shoes and have worn them once, but I found they fit larger than my normal Nike size. There shoes are almost like new. There is a yellow stain on the back of the left shoe (see pics). I’ve tried to hand wash but haven’t been see any chemicals. I’m not sure if it will come out with soap or sneaker cleaner. Very comfy shoes but fit a bit big.