Probably not gonna work for 10k for blue toothbrush left in the guest bathroom, but lawn tractor and gardening equipment, appliances, even window coverings, excluded in sale.

So it is labor intensive... but if you mix baking soda and bleach together to make a paste, then scrub that on the grout with a toothbrush, let sit then rinse.

If they turned off some/all utilities (assuming they were at some point in the tenants name), AND there is nothing but trash left in the unit (no useable furniture, no current groceries, no clothes in closet, no shoes, no toothbrush in the bathroom or meds in the cabinet), check local law but that IS abandoned...not allegedly abandoned.

There is no line in the sand rule, if her tooth brush is there she might claim I broke in Blah Blah. 

The closet in the master is our personal cloths etc.. one in kitchen is exta dish tabs, toothbrushes, random stuff. 

Example: Bed, bedding, toothbrushes, clothes etc... see if the utilities are on.

What does the apartment actually look like...did they just walk out one morning with coffee cups on the kitchen table, clothes in the closet, multiple pairs of shoes, medicine cabinet looking normal, perhaps with toothbrushes still in place?

You can remove rust spots with a toothbrush and baking soda (ask me how I know...). 

Disposable old toothbrushes help in getting into the window tracks.2.

By midnight her phone and toothbrush are likely at full power and you can turn off the power to those outlets without interfering with the tenants' use of those devices.