Hi! I need help. I recently got a G1 Twilight with a rust issue. I've never actually had a pony with rust issues before, but I did eventually manage to get her body/head cleaned out. (Also, is it normal to have particles that feel like salt/sugar inside the pony? What are they, is it rust? I didn't think it was rust, but what do I know, I'm inexperienced.

) Still, there are rust stains in her tail and her hair has a strange texture. Compared to other G1 ponies, her hair is weirdly stiff, though it is brushable. I've already washed her hair with shampoo and conditioner. Should I do it again? What should I do? Please help!!!