It is not necessary to tip Airbnb cleaners, but if you would like to show your appreciation for their work, you can certainly do so. Some guests choose to leave a small cash tip or a note thanking the cleaner for their services. You could also consider leaving a positive review for the cleaner in the Airbnb review system, which can help them get more bookings and earn more income. Ultimately, tipping is a personal choice and is not required, but it can be a nice gesture if you feel that the cleaner went above and beyond in their duties.