@Yulianna0 @Nancie5
I could be wrong but really don't think ever-lengthening house rules have the desired effect – TL;DR and some people just don't, or can't, do cleaning. I reckon you could have a big poster on each wall, giving explicit, step-by-step instructions, with diagrams, on how to clean that particular area of the home, and it would still be ignored by some. (And your place would look like some institution...)
I agree with those who've said that the solution would be for hosts* to have control over the deposit and to be able to use it to cover extra cleaning costs. But Airbnb just does not co-operate with hosts** in that regard; instead they control the deposit and they take the side of guests. Presumably they think hosts should just absorb the extra costs, who knows...
[*possibly only hosts who have a proven record, in order to avoid scammers?]
[**Oh I forgot! Except for the big professionals, who are allowed to request CASH deposits from guests on arrival, according to threads on here...]
Maybe a solution for hosts would be to put aside a certain amount of money each month, as a contingency fund, for the hopefully rare case of guests leaving places in a terrible state. Hosts could then take stock on an annual basis, and determine whether or not it's financially viable.
(We're an on-site hosts; we do the cleaning ourselves; haven't had any gross guests, just a few about whom we have a good old grumble... but I still feel outraged when I read about guests' behaviour...)
The only other “weapon” we have against slobby guests is the review... ha! That only seems to work if we make sure we haven't given guests a clue that we're p*ssed off about the state in which they've left the place, which would alert them to the fact that we were going to give them a bad review, and thus triggering the retaliatory review! (The review system is SO broken...)