1 of 2 tenants moving out & perplexed how to deduct from SD (renting per bedroom)

[Jill Jay]

Good morning! Wondering if anyone else here rents per bedroom to college students? I'm a somewhat new landlord & have 1 tenant moving out while the other is staying. Wondering how to go about the security deposit & getting the unit ready for the next tenant. Cleaning fees are usually taken out at the end of a lease but how would that work when 1 of the 2 tenants are staying? My thoughts are to hire a cleaning company for the common areas & her bedroom but to be honest I don't know if it's even possible to fairly deduct from one without affecting the other's security deposit until the following year when they're graduating.

Thank you for the help BP  :)