This is one of the hottest subjects in property management, and renting properties out in general.
Setting expectations before the lease is signed is important. Having those expectations in writing is a great way to minimize disputes regarding return of the security deposit.
Documenting condition with both videos and photos also aides in clarification as to how clean things were when a tenant took possession. Without detailed documentation, it can be cumbersome to get a property back in the same condition from a tenant. You may have to withhold part or all of their deposit.