@Melissa1285 Any time you rent out a property, whether it's through AirBnB or other OTA or your website or whatever, you will get issues like this. You can set as may rules as you want, but sometimes, people will break your rules. You often won't get any support from OTAs.
Even if it's not breaking the rules, we can still end up with unpleasant smells in properties. The worst is curry - some guests love to cook a curry and the aroma lingers for ages. It gets in all the fabric, the bedding etc. We often have only 5 hours to turn a property round for the next guest - curry smells are a nightmare.
You're in business, so you have to run it like a business - prepare for the worst. Most of the time, everything will be fine, but sometimes it won't.
So it comes down to "how do you clean up after guests and prepare for the next guests" .... we clean, clean, clean .... if it's smelly, we ventilate the entire property for as long as possible, we clean down every surface, we use odour neutraliser sprays (not too much as they can be stronger smells than the original smell), we leave nice, gentle solid gel type air fresheners (not overpowering) .... if necessary, we can clean carpets and upholstery .... if our cleaners go in to a property and discover it's a bad mess, they tell me, I call in extra help immediately .... and as a last resort, if we can't get a property ready in time, we either relocate the guests into other properties we manage, or we apologise to them and do what we can to help them enjoy their stay .....
If we ever have to call in another company to help, that is extra cost .... we know we'll have to do this a few times, whether it's for repairs or cleaning or whatever .... but we factor this into our nightly prices through the year .... an extra £1 or $1 per night is a tiny amount for each guest and they don't know or realise that we're preparing for emergencies .... but it's set aside to cover "emergency cleaning / maintenance etc" .... over the course of a year, it mostly balances out .... and that's what you do when you're in business .... and as you're renting properties out, you're in business .....