@Lisa10385 It sounds like you are doing full on vacation rental management. Are you also coordinating repairs, answering distress calls at 10PM becuase guest can't operate the TV or find a wine opener? 🙄
In the US, full vacation rental property management is 20-30% of booking. I don't use property management for this very reason and I am unsure if cleaning fees and taxes are included in that percentage range.
What I would do is shop some vacation rental management companies in your area to find out what they are charging and what is and isn't included. This would be the best way to approach your owners if there is a large delta as to what they are paying you and what PMs are charging in your area.
Best of luck I hope you get paid what you deserve soon.
Karen