Mid-Stay Rentals (MTR) offer steady money with leases from 1 to 6 months but with okay cash chances and strict rules.

I am also concerned because my goal doesn’t create any money (there isn’t any money that building this house will make). 

We lost money.

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Does anyone have profitable ideas for utilizing former car washes as investments? 

It sounds as if you are trying to do this yourself to save money, which is why your tenant is upset.

If you charge a large fee up front, that money is already gone and you have no leverage for the tenant to comply with paying their last month of rent or returning the unit in good condition.I would consider looking into something like Obligo.

Maximize your W2 earnings, get a 2nd job, swallow your pride and live at home (if that's an option), don't spend a dime on anything if it is not food, housing, or transportation, and pile up money. 

For emergencies, I could move money from my 401k to an IRA to cover vacancies and capital expenditures.

Fresh out of college, we moved to Dallas, TX to take on entry level jobs making very minimal amounts of money.