We provide dark grey washcloths in every bathroom for just that purpose.

Try looking into zillow/Redfin and see what your potential rents you can get near the neighborhood by filtering the bedrooms/bathrooms of the intentional property that you are planning to buy.

I am really waiting for robot can be available and affordable to clean the grill and bathrooms, or make the beds, or laundry...

The  unit is rented consistently and is functional but also needs upgrades, new siding (has 2 layers), Some rooms could benefit from re-wiring and more insulation,   Painting is always an issue as it is not plaster but older thin wallboard. kitchen is fairly new, bathroom could use upgrade, upstairs bedrooms have some pitched ceilings but I don't think based on the foundation/construction it is a candidate for a full second story and it had a new roof a few years ago.

The house is a 2-bedroom, 2-bathroom with 1200 sqft of space, fully furnished, and it allows dogs.

The 9 apartment units will be turned over (leases are terminable with 60 days notice) and will receive new kitchens, bathrooms, in-unit laundry and general bldg deferred maintenance improvements.

However, the downstairs bathroom has sewage coming up out of the toilet and all over the bathroom floor.

As I am living in the property I am updating things such as the bathroom, paint, cabinets, countertops, and doors.

Is it just upgrading the floors, kitchen and bathrooms? 

Although I may push back on the bathroom tv.