I've been washing houses for a couple of years now and recently started cleaning roofs. Have not used sauce/cider but believe I understand and can do it. Here's my question. Is that what I should use and would work with this roof? If so, what should the % of SH be in the solution? I would really appreciate some expert advice.
I would use the following mix INSTEAD of the sauce or cider.
Use 35 percent Sodium Hypochlorite, 60 percent water, with a caustic overide of 10 percent Sodium Hydroxide.
So, for 100 gallons total mix, we need 35 gallons chlorine, 60 gallons water, and 5 gallons liquid Sodium Hydroxide 15 percent.
Sometimes, Sodium Hydroxide comes as 50 percent, so be careful.
IF it comes as 50 percent, do NOT add 5 gallons.
Dilute 1 gallon of 50 percent Hydroxide in 4 galons of water, and add THAT.
Sometimes, the saponification of Hydroxide is necessary on heavy organic deposits, like this roof presents.
You will alos benefit greatly by adding a little surfactant that is high PH compatable.'
This will aid you with better dwell time on a steep roof like this.