@Aleksandra0 I've had a few times when stains had dried and were NOT to be removed no matter what and trying to charge for time/cleaning is almost a joke. So I searched CC and found the format for this paragraph that I messaged to guests. And surprise they were gracious. I would eat some of the cost and try 25-30 and folks don't freak - but more you will probably get a rejection. I found this much better than those that message asking/demanding to know WHAT is the Stain? and then the guests says what stain??? we didn't do that. Anyway, you might find something like this works for some folks.
actually part of the 2nd sentence is not true - BUT - it works. happy hosting, Clara
"Hi, thanks again for staying with us! It looks like there are some stains on the sheets, and for everyone's health and safety, stained sheets need to be disposed of. Luckily, Airbnb's security deposit system makes it easy to add the replacement cost $.... to your booking after we provide documentation. We've had this happen a few times, and guests are always gracious in handling it. If you'll approve the security deposit charges when we submit them, we'll be all set. Thanks again, and all the best.