Rental company suddenly requires a “professional deep clean” not stipulated in the lease

I’m moving out and apparently I’m gonna be charged a $200+ cleaning fee. Backstory- I rented this apartment about a year ago and I’m a good tenant (always pays on time, quiet, courteous) and I did a pre walkthrough with the property manager. I was told by the manager they now require a professional deep clean documented with a receipt because “since Covid, they have really high standards for cleanliness” or I’ll be charged the cleaning fee. None of that is stated in my signed lease…

Now I get this, but I started renting AFTER Covid. And none of this was mentioned during move in… and none of this is stipulated in writing my lease rental agreement. My lease agreement only states that “IF I don’t clean adequately then I am liable to reasonable cleaning charges”, not that I’ll be charged a cleaning fee no matter what because of new covid standards.

Help? Is there a lawyer in the house I can talk to? I really would like to avoid paying a cleaning fee and I feel like it’s very shady of my rental property