That'll be a $300 cleaning fee for 2 nights, oh and here's a snippy message about how you left hair in the drain and used an extra towel. Be a dear and don't use the toilet next time too, that's extra.
edit: spelling and formatting
The last time I stayed in an Airbnb house I got a laundry list of accusations. I challenged them as well. (They even went as far as saying that I used too many rolls of toilet paper that weekend) It's a good thing I'm not easily embarrassed.
And 10% of what? If someone books a day, yes, the cleaning fee is more than 10% of that. Don’t like it? Go get a hotel where it’s baked into every night.