I am trad but I would not spend all that money and only use your system to do half the job, and the end of the day it is the faster job times that is going to pay for the investment. I would compose a summary of how the system works and why it is better with before and after picts of conservatories etc, emphasis on a seven day guarantee if that is something you would consider (i.e. you see any marks you don’t like we will come back and fix it. no hassle or fuss). Then give that to each customer for the first month.
You are going to get a couple who will be a little sceptical of it, but just let them know that is the way you are cleaning them and clean you will get them as promised if not you can have your money back.