I am concerned that title to property secured through a tax sale may never be "squeaky" clean.  

Cost of cleaning between tenants depends on the region you are in, size and condition of the property.

4th pic: Open Shell - Nice & Clean!

Many students try, unsuccessfully, to sub out their lease over the summer.Expect damages, most students don't keep the place too clean, so account for that beforehand.

I generally use this detergent to clean oil spots on the driveway, not to use it to clean any linens or towels.

I was also going to call estate sale, estate clean-out and debt consolidators.

@Tom HurfordThe house is 2400 square feet, brick. 4 beds, 3.5 Bathrooms, University Heights, OH (near Cleveland)ARV: $240K-$260K Initial Budget was $58KBid from contractor: $59KMaterials I am providing: $16K (incl 2k contingency) (in bold below)Rough Scope: Landscaping (clean out window wells, remulch beds, trim bushes and trees)- L: $1845Masonry ( Tuckpoint Chimney, Tuckpoint exterior masonry around porch, powerwash brick) L&M: $1200Windows (Replace 16 Windows): L&M:$3600Roof (Inspect Slate Roof): $150Gutters (Replace all gutters): L&M: $1200Deck (Powerwash and stain): L&M: $500Front Porch (Scrape and Paint Iron Railings): L&M: $100Exterior Lights (5): L:$100, M:$200Kitchen (Complete upgrade, counters, cabinets, tile floor) L&M: $11,000, Appliances: $3,000First Floor 1/2 Bath (Complete upgrade,): L:$2000, M (supplied by me):$550First Floor Master Bath (Complete Upgrade): L:$4500, M (supplied by me):$2400Second Floor Main Bath (Complete Upgrade): L:$4500, M (supplied by me):$1800Third Floor Main Bath (Complete Upgrade): L:$2000, M (supplied by me):$1600New Entry Doors and Lockset (3): L:$300, M (supplied by me):$1025Finish Basement walls and ceiling (Frame, drywall, and Trim, 400 sq ft) L&M:$10,000Finish Basement Flooring (LVP): L:$1500, M (supplied by me):$1000Refinish Hardwood (1300 sq ft): L&M: $5000Electrical (Replace outlets, switches, faceplates, interior lighting): L:$1100, M (supplied by me):$1026Paint Prep : L&M: $600Paint Interior (floor (basement), ceilings, walls, and trim): L&M:$5000Exterior Painting (Garage door, house/window trim): L&M:$2500

Things like not cleaning up fully after working, or not securing wiring fully are things why I say quality is not the best it can be. 

That said, simple rehab projects if done full time and correctly should expect to have about a week per $10,000 of budget plus an additional week or 2 for clean up, market ready items, misc.

If there are any areas of walls that need dings and dens fixed, I would be inclined to mark them on the wall and describe them in the scope.Make sure to indicate very specificallythey are required to clean up after themselves and to not clean their tools in your finished sinks.