SH House Wash Mix Question?

Hello Everyone im new to this group, I started a small pressure washing business a few months ago. I have been washing 2-3 story brick homes and have been having trouble finding the correct SH/bleach mix to softwash black mold/algae on brick to where it falls right off! i use 8.25% store bought bleach/water and green dawn soap. i have a hydrotek 3,500 psi 5.5 gpm with a 250 high pressure hose and i downstream. Any info would help thanks!
 
I've used up to straight 12.5% on heavy algae on Brick and still had to use some pressure. It just doesn't clean as easy as siding or stucco.
 
Whether down streaming or using a dedicated pump, on brick, concrete block, and other porous surfaces, especially if it's heavy, you are going to have to use a little bit of pressure. It's just to porous and isn't not going to rinse off easily like smoother surfaces. We will either use an adjustable wand or a 2560 nozzle. Depending on the brick, sometimes an open ball valve. It doesn't require a lot of pressure but you will Need some none the less.
 
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The answers above are spot on,....And most likely will solve your issue.

But keep in mind, maybe irrelevant,..and not trying to be insulting on your evaluation skills,..but with brick,..especially with older brick,....make sure you know for sure what you're trying to remove,..brick and other masonry,(Porous),...surfaces can gather alot of airborne dirt, exhaust smoke, etc.... and SH will not be very effective on this type of "Dirt". Green algae is easy to evaluate,..black mold though,..can look the same as airborne crud.

Jeff
 
sounds good. i have a telescoping wand but to heavy i dont like using it lol i guess ill have to break it out!
 
so if i was to use straight 8.25% or 12.5% chlorine on colored brick it wont dry it out or discolor it, still skeptical bout the bleach around wood doors etc.. i know to water plants,grass etc..?
 
so if i was to use straight 8.25% or 12.5% chlorine on colored brick it wont dry it out or discolor it, still skeptical bout the bleach around wood doors etc.. i know to water plants,grass etc..?

being careful around stained wooden doors is a good idea...
 
wet them down.... dont intentionally spray the door with SH even after wetting.... only spray around the door not on it.... Ask me how i came to this realization... On real high end houses with huge wood doors with real nice stains we plastic them off... taking no chances.
 
Unless already using one,...use a pump sprayer around delicate situations,..way better control.

Just work your way around the door or whatever until you're comfortably far enough away to use a more "speedy" application.

*Still use the methods as mentioned above as precaution. If you do the plastic,,...you can jump right to the more GPM method of application.

Jeff
 
thanks i will keep that in mind, i was thinking plastic as well. u think for siding, stucco, 2 gallons of 8.25% SH with 3 gallons of water an healthy squirt of green dawn is decent mix?
 
thanks i will keep that in mind, i was thinking plastic as well. u think for siding, stucco, 2 gallons of 8.25% SH with 3 gallons of water an healthy squirt of green dawn is decent mix?

If your downstreaming that mix wont touch stucco... If its stucco I'd DS straight SH and hope the results tell me that i dont have to pull out my xjet/dedicated chemical pump. The mix your mentioning is a great mix for vinyl... not for porous things.
 
thanks i will keep that in mind, i was thinking plastic as well. u think for siding, stucco, 2 gallons of 8.25% SH with 3 gallons of water an healthy squirt of green dawn is decent mix?

call russ and get some roof snot or bleach plus... call paul and get some stick up.... call bob and get some elemonator... phase out that dawn and get a soap designed for the cause. Specialty soaps are still pennies a house wash and are specifically designed for what your trying to do.
 
For vinyl siding you want 1-3% SH hitting surface,..evaluating the strength comes with experience. For the stucco,..I would listen to the above responses regarding strength. But a starting point in my opinion would be about 4%,..again,..evaluating the strength needed will come with experience. So many variances in mold growth, surfaces etc,..that you can use these suggestions as a guide,..but you will learn in time what you need to do.

Jeff
 
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