Get (3) of these a night in a 50 mile radius and its great money- with or without employee's. The problem is the interior or not. If you add one of these a night to your regular commercial nightly route, puts at least a $100 dollar bill in your pocket. It's $200 dollars for tops two hours of work. I recognize drive time, set up/ break down, but if it fits into an already developed route its another Hundred dollar bill to add to the pile.
Always to ways to look at work- either I'm too small of a company to make $200 dollars worth my wild, or volume and another $100 bucks on your tech's way back in to the yard that night. Trust me a few years back, I also would of said "No way its not worth it"- or I need that extra money.
Today- with a National Company- that I know pays and I do business with- I just signed on to clean windows at a Grocery chain, 3 stores within 10 miles of each other for $115 dollars per service 2x per month. 3 stores at $230 month equals $690 a month for actual work time of 5-6 hours. We run 2 man crew- one outside with water fed pole- other inside using a new interior cleaning pad pole method. It will take less than an hour each store and fits right into the route. Created a truck with DI tanks next to water tank and blah, blah.
Each price works for a different type of company. Like I said, I may have written the same head line 3-4 years ago, but I have learned how to make it work.
Systems and procedures get you paid- volume and $100 dollar bills also help.
Just my 2c