/cgl/ - Cosplay & EGL

I just got a dress in the mail that I knew wasn't in brand new condition. For the most part, it's wonderful but there's a small yellow stain along the tulle-ish part of the chest. Does anybody have a good way of getting it out of that kind of fabric? I was thinking about gently dabbing it with a bleach pen but I don't want to ruin anything under it. Pic related, it's the dress.