Bought property for $36,000, previous sale $108,000, needed partial roof repair, clean and paint, rent $895, already had new gas furnace and central air conditioning, off street parking, fenced yard and deck.#2. 

and then again, there are some with resounding positive reviews and clean records. 

Do I also take into consideration the cost to clean up the entire place or cleaning up perfectly doesn't matter since poeple are willing to live there in current condition? 

It has our city and a little tagline of "Providing affordable, clean, and safe housing", with both of our names and contact info.  

I made a clean and over asking price offer before the open house on my personal residence.

I had my title company pull title and it looked clean.

Cheap rentals require cheap repairs.One interesting thing I just observed is that over a 20 year period on a sfr my monthly cost for maintenance, cleaning, repairs and capex were $171 pm while a duplex during the same time had a monthly of $195; only $24 higher for the extra unit.The big thing though is that the sfr has appreciated at twice the rate as the duplex.

I'm Considering a much larger complex that would need cleaning up and much more attention than the current owners are giving it.

Would you be willing to clean up a unit during a turnover? 

I would say the site is about 3/4 of an acre  about 100 by 300... mobiles are old dumps by and large.. but inside a few I looked at the folks kept them clean..