Pressure wash new business question.

Apologies up front if this is a bad question. Thinking of adding on to my existing business (sandblasting) and thinking about a commercial pressure wash set up Not all my stuff needs to be blasted so just kinda thinking out loud and I could be washing on days that I am rained out.
So. I know every area is different for its economy (I’m In Canada) but what’s an average hourly rate for washing with good pro equipment as a business and not the “will PW for beer” kinda guy.
I have tons of equipment customers as well as wood and concrete guys so I have a foot in the door already and run an established business.
I know this is like asking a builder “how much to build me a house” but just curious to see if it’s worthwhile.
Thanks in advance.