@Lisa5515 Generally speaking, at an Airbnb, whether there is a cleaning fee or not (you need to understand that even if there isn't a separate cleaning fee listed, just as with a hotel, the cleaning costs will be built into the nightly price), what guests are expected to do is to clean up their own personal messes.
So, washing all your dirty dishes, wiping down greasy kitchen countertops and stovetops, making sure all garbage is in the bin, not strewn around, and if you have children who you allow to eat anywhere other than the dining table, making sure there aren't bits of food or crumbs in the carpets or furniture (which a vacuum cleaner would come in handy for) or sticky little hand prints all over.
If there are smelly things in the garbage, like strong-smelling food, or used diapers, you should tie the garbage bag up tight and put it out wherever the garbage goes. Many hosts are leaving at least 24 hours between bookings now due to COVID, so the house could get quite stinky if these things were left in an open garbage bag inside, and food left out, or crumbs in the carpet could attract ants and other insects or even rodents before the real cleaning gets done.
Heavy duty cleaning- thoroughly vacuuming the entire house, washing floors, sterilizing the bathroom and other high-touch surfaces, dusting everything, checking for cobwebs, checking to make sure the dishes were washed well and rewashing if necessary, doing all the laundry, etc, etc. is cleaning that hosts or their cleaners would do.
There are indeed some hosts who use that phrase "Leave it as you found it", but I feel that's not a good phrase- obviously the house is going to seem lived-in after guests leave, and any host who expects guests to leave it clean enough for a new guest to check in is being ridiculous.
If a host expects guests to do heavy duty cleaning, they need to make that clear in their listing information, not just spring it on guests after they arrive. Then the guest has the option to simply not book that place.