What a move-out clean covers
A move-out clean is a deep clean of an empty home, judged by someone else: the landlord, the property manager or the buyer at the walkthrough. Customers expect the inside of cupboards and drawers, the inside of the oven and fridge, baseboards, light switches and marks on the walls. Write the list into the service description, so the customer knows what the price buys and the walkthrough has nothing to argue about.
Because the home is empty, the work is more predictable than a lived-in deep clean, which is what makes a fixed price by size safe to publish.
