I've been hearing that magic erasers are pretty good for getting off layers of dirt on ponies but how harsh are they? Gentle enough to go over symbols and other paint or should I avoid using it on paint-heavy ponies? Also, what about glitter symbols? I know it's a bad idea to really scrub them in general but a pony in particular I'm worried about is a G1 Sweetheart Sister Twinkler. The one I've got is fairly dirty and a basic wipe down hasn't been enough to get rid of all of the dirt so I thought I'd try Magic Erasers before resorting to a good scrub. I'm afraid to try it because she is covered in glitter symbols.
Super-duper gentle! You can use them over symbols and eyes without harming the paint.
I would avoid glitter symbols. You can lightly swipe the magic eraser over glittery symbols, but I wouldn't rub or scrub. Sometimes a light swipe is all you really need. You can also tear a part off and use a smaller bit to get into those areas around the glitter symbols.
Don't use them on painted parts Barbie-type horses (Dream Beauties, Fashion Star Fillies, Grand Champions, Breyers, etc.) The erasers will rub that paint right off!