tenant wants me to pay for 5 days when they left early

[Scott W.]

month-to-month that expired on june 30th. they left on june 23rd & said would still need to clean & were paid up until the 30th. I went in and made it rent ready (put in a lot of hours). walk thru on the 30th and they said, "you did a lot of work in here. you need to pay for the 5 days."

they did clean the place before leaving and were great tenants so I agreed but what would you do in this situation? I got the new tenants in on the 29th so had only 5 days vacancy.