Scott
I would say remove the actual cleaning process but for a different reason.
I gather from your previous posts that you are using Chlorinated Tri Sodium Phosphate,which is a highly toxic and dangerous mix.
The concentrations recomended on this and other boards are NOT approved or suggested by the Asphalt Roofing Manufactures Association (ARMA)
In the video you have absolutely no protective gear of any kind. No repirators, proctective chlothing, gloves,, eye ware, boots, just nothing.
Chlorinated TSP is toxic to the touch, inhalation and eyes. The MSDS sheet on TSP reads "avoid all contact"
It can cause Pulmanary Odema, eye damage skin damage
and a whole plethara of things you don't want to get.
Did you warn your customer and employee of the dangers involved with this mix?
Read the MSDS sheets that come with the products you're using and do a little research on the net in how to protect yourself or for less harmful chemicals