Hi @Kelly1365
I think you are handling this from the wrong perspective. I would ( and have) done the following. I have a few properties which for example can sleep 6. I charge a basic nightly rate for upto 4, then an additional €20/night for the 4th and 6th. But if guests book 4 and try and "sneak" in 5 or 6 ( as they can see capacity at booking time) then;
Have a clear House Rule as follows;
"We are very strict on the occupancy of reservations. If more than the number of persons than stated on the booking are found to be staying in our residence, we will charge €100 per extra person for the total number of nights booked".
This way if you find 5 or 6, then get some evidence, eg. admission by guest, pictures of beds / linen used, plates set up in dining area, luggage etc. Send an immediate message to guest via ABnB inbox that you found this and is a contravention of the rules.
Submit a claim "money request" via resolution centre pointing to extra guests, attach photo evidence, and specific House Rule contravened, and claim e.g : 2 extra guests x 7 nights ( as per House Rule No. x, €100 /g/n ) = €1,400.
Involve ABnB if guest refuses to pay, as they usually do.
That should take care of your laundry cost 😊.