How to make a discolored pony white again?

[Safflower]

KottonKandy, have you tried nail polish remover or rubbing alcohol? That might work (just be careful not to get it on her paint.) And Eldarwen, there's no way of telling how long it will be until problems arise. Like Hanah66665 said, it could take a year, ten years, or even twenty for problems to show up. Anyway, like you said, personal opinions Like I said, glad it worked for you If only I had enough ponies to test your methods...

[Eldarwen]

Yeah there can be problems later. But I don't see the problem in it if the pony is awful looking to begin with.  Nothing to lose. Assuming you're not planning on selling the pony ofc!

[Safflower]

Yeah, at least it helps a poor discolored pony for a while