NewYorkBoraPL

I will be doing my first stucco cleaning next weekend. I have done a lot of research, but still have a few questions. My rig is a 2500 psi 2.5 gpm. I want to buy some nozzles with a larger orifice size to lower psi to around 500 or 600 psi without sacrificing water flow. Basically I want to run maximum engine speed(RPM) and reduce the PSI not to damage the stucco. Also I want to give Sunbrite Powerhouse mixture a try. Anyone have anything negative to say about this. The stucco is 7 years old and has a buildup of algae, mold, black spots in some areas, no rust that I can see but you never know. Thanks a lot.

Thanks for the information. By the way the powerhous mix does not contain a bleach in the ingrediants. I was browsing through chemistry store and was not able to find sodium hypochlorite. Is Sodium Percarbonate a good substitute or should I purchase elsewhere. I also would like to add some TSP to the power house solution.