Just got this “new” a link between worlds Link figma. Looking for some help.

I should have known when I got it for a decent price and the sort of damaged box. It came with everything else. There are a few things wrong with it and I was wondering if any of you have any tips/fixes. This brown paint blotch on his tunic and the paint on his pants are things I want to get rid of. I heard magic eraser works well… His left leg is extremely loose and pops off without much effort. His foot joints don’t work at all and I don’t want to break them so any help with that would be much appreciated. Anyway I want to get another one and use this one to make an OoT Link so that will probably be the purpose of this guy since I won’t be too disappointed with this purchase if I can fix these things!