The thing about dolls is, things like staining and dirt tend to come part and parcel to playing with them. Sure there are collectors that keep their dolliehs locked up in a glass display case, and there are others that carry them around everywhere with them. Both ways will be met with mixed sentiment, depending on where you go, and who you ask, but one thing to always remember is that it's your doll, and it's up to you how you're going to handle/treat him/her. If you'd rather not risk staining or damage, the glass case is the way to go. If you'd rather be able to play with and enjoy your doll, then you'll have to accept that stains are a part of dollieh life, and the most you can do is minimize the risk, and keep the essentials on hand to clean them if it happens.
That being said... Kiki's links are invaluable... and touching the face...yeah... DON'T DO EET! The more you touch the face, the faster the face-up will deteriorate. The first doll I got home, I didn't know any better... teh Kiki scolded me when she was in Orlando LOL XD