Where does it look that way @Mandy614 ?
If you added the cleaning fee in the pricing tab, it should automatically be added to each booking (a cleaning fee won't show on the individual nights on your host calendar, because it's not a per-night charge).
I wanted to check for you by adding nights in guest view and calculating the change, but then I noticed this callout which complicates the pricing: when I select two nights, it asks me whether I want to add a third at a special rate.

I think this is great, I haven't seen this display before. Do you know how you're doing it?😀
Is it a professional hosting tools rule that you're using?