There is no polite way to say it. If you want to be indirect or non-confrontational about it, try this:Seriously whats a proper way to say this to people?
When you're eating with her, pretend like their are crumbs stuck in her shyt. Ask her to wipe her mouth and be like, "Oh, nevermind"
I get both done every 2 weeks and it's only abt 10$