But it's also because this is outside the white-washed western neighborhood where all the malls and hotels are at.

I always buy buildings that have separate water meters so I don't have to pay people's water if they wash cars for the neighborhood out front or take 5 hr showers etc.

During the 2 years, I received several surprise assessments that had to be paid relatively quickly- One was an assessment for my portion of the roof and another was an assessment for pressure washing. 

Do you have to wash Off the residue of the acid afterwards?

I have rented turos where they required that we returned it washed and vacuumed, so the owner didn't have to do it.

In the meantime, consider using bed covers, thorough cleaning, keeping items off the floor, setting up bed traps, and regularly washing sheets to mitigate the issue.

Banks would use 75% of your rental income so if you move out of a unit that new rental income would be counted toward your dti / It is almost a wash, although I don not know your total picture you should be able to enjoy your new sfr without much impact 

In many parks pulling in homes is a wash at best.

When will you pressure wash the property?

There are over 50 bath towels, hand towels and over 100 washcloths.That way if they place is a real mess on a back to back, they can wash what they can (the towels first) then toss the rest in the hampers in the garage.