What to do when a female friend wants to try your AVP but has makeup on?

She wears a ton of makeup and I'm not sure what the best approach to go about handling this situation. I am very OCD about my stuff and baby it so that it stays in pristine condition. I don't want to seem like I'm coming off as impolite by asking if she can wipe her makeup first before wearing it because I don't want to risk any makeup products that could potentially leave stains or what not.