Instead use a strong detergent like Mr.

Repainting the laundry rooms, installing commercial quality scissor gates to secure the alcoves (tenants were complaining that the other tenants were stealing their detergent, etc.), and installing the coin-ops was the first capital improvement that we made.   

There might be a washer/dryer, but if there was there was no detergent. 

It was, but it was dirty so I asked tenant for his dishwasher detergent to run a quick clean cycle.

Then you need to estimate operating and maintenance costs, i.e. when you own an Airbnb, you provide paper towels, toilet paper, detergent, sheets (and therefore sheet replacements), towels, etc, plus you are paying for utilities, which you don't pay for in LTR (electric, maybe water, netflix/cable/etc).  

Toilet paper, paper towels, dish detergent, laundry detergent, branded soap and shampoo, coffee, etc.

Powdered laundry detergent , hair conditioner and the dreaded white tailed mice cause more problems than lint  

I have dishwashers where someone went to town pouring dishwasher detergent in there, and the only consequence was unused dish detergent all over the dishes. 

On the parking lot get gallon sizes of detergent and pour in front.  

In the past when everyone is on a long term lease, I stop providing common area supplies like toilet paper, paper towels, laundry detergent etc. anything that is usually wasted.