We have similar problems. A recent guest wiped her acme medicine all over her bath towel and bleached it out. Another guest slept on the comforter and not between the sheets. Another soaked the basement by not putting the shower curtain inside the shower, so the water drained down. We have taken all of these problems and created a laminated "House Rules and Expectations" card in every room and on our guest check-in dresser. This is exactly what each of our listings say online. People check the box that they read and agreed to all the rules, but they don't read it. We have a "no smokers of any kind" policy. It's the first thing in the description. We still get guests reaking of smoke. It is a really negative experience AND Airbnb expects us to give them a refund. That really hurts. We have to dehumidify, purify the air, clean EVERYTHING and still give them a refund? Seriously, this is a problem. And these are the ones that give us the worst reviews. I call Airbnb immediately for help. We need to charge for damages. Towels add up. Our time is valuable.
BTW, we don't let anyone use our kitchen, except for microwave. We serve breakfast on (nice) paper plates with paper nampkins, use cheap quality utensils. We save a lot of money and time with less breakage and no kitchen messes to clean up. We also screen very carefully and decline if the guests are rude, abrupt, and/or give no information. We never allow a guest in our home without a facial photo to I.D. them. There are so many new Airbnb members that have no clue. We end up teaching our guests a lot. The next hosts get the benefit of our hard work. And so it goes.
Bottom line - we've made so many wonderful new friends who've become an extended family from around the world. After 3.5 years as Super Hosts, we are very pleased by the the results and the tax breaks that allow us to improve our home in ways we could never afford to do without the extra income and motivation.
It's a win-win with just an occasional downside. In for the long haul!