hi..i am not sure if this is the correct place to ask. I've jz bought myself a 12inches super mario figure. it is a second hand item, thus it is not as clean as it should be. The main problem is the hands (gloves), as they are supposed to be white in colour. Right now, they are yellowish with some part being very yellow (as shown in the photo below). Would like to ask all of you who are so expert in action figures (though i doubt this mario is an action figure..haha), how do i remove the stains and make it perfectly white again?

thanks!