@Adam2336 You should estimate the average cost of cleaning after guests with pets.
From my experience, it’s advisable to set the fee slightly higher than the estimated cost to account for any unforeseen cleaning needs or to ensure the next guest has a satisfactory experience.
On one occasion, I offered a guest a refund of the pet cleaning fee if the place was left in a condition that required no extra cleaning, and I followed through on that promis
e.