I got my first G1 ponies and they need to be cleaned up, especially Sugarberry, but I'm super nervous about it. Sugarberry has some light stains around her symbols and she's a bit discolored all over, and I've been reading up on how to clean them but I can't find anything about protecting symbols. Sugarberry is covered in them! So, what's the best way to clean and lighten her up without risking the symbols?