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Old 04-23-2014, 08:15 PM   #1
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Default What's the ideal bleach % for house washing?

I spoke with my local pressure washing supply company and the guy said he can get me bleach in any concentrate up to 62%!!!
I think pool bleach is typically 12.5 and household is now 8% around here. Downstreaming is typically 1:10 so would 20% be too high? That would really only be 2% on the wall. Most recipes say 1 part bleach 3 or 4 part water and some soap. Which is 25 or 33% yes?
Otoh I've used household bleach and it seems to work pretty well.



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Old 04-23-2014, 08:18 PM   #2
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12% is good. Much higher is too unstable and would be hard to store. Twelve percent will burn you nicely and has some hardcore fumes. I can't even imagine handling a 62% sodium hypochlorite solution.

Your mix is going to depend on what you are cleaning. To remove mold from painted trim/wood and vinyl siding, a solution hitting the house of 1.5% is good. I use 3.5 gallons of 12% and a house wash mix with detergent builders topped with water as a downstream mix.
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Old 04-23-2014, 08:50 PM   #3
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Originally Posted by Damon T View Post
I spoke with my local pressure washing supply company and the guy said he can get me bleach in any concentrate up to 62%!!!
I think pool bleach is typically 12.5 and household is now 8% around here. Downstreaming is typically 1:10 so would 20% be too high? That would really only be 2% on the wall. Most recipes say 1 part bleach 3 or 4 part water and some soap. Which is 25 or 33% yes?
Otoh I've used household bleach and it seems to work pretty well.



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I've always thought when they said 1 to 3, they were talking 1 part HOUSEHOLD bleach, which would make the final solution about 2% NaClO

That's about what we used when we were hand washing with long handled brushes. (plus the TSP and dish detergent)



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Old 04-23-2014, 09:36 PM   #4
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12% is good. Much higher is too unstable and would be hard to store. Twelve percent will burn you nicely and has some hardcore fumes. I can't even imagine handling a 62% sodium hypochlorite solution.

Your mix is going to depend on what you are cleaning. To remove mold from painted trim/wood and vinyl siding, a solution hitting the house of 1.5% is good. I use 3.5 gallons of 12% and a house wash mix with detergent builders topped with water as a downstream mix.
So, top off the 3.5 gallons bleach and soap with 1.5 gallons water and downstream away?

Since I switch to pressure tek down streamers I feel like i have not got my mix dialing in consistently. I use liquid pool bleach though and I do not think that quite hits 12%. It seems like I am using more bleach than I used to use for some reason. Probably just pushing more water through with the newer setup as well. I would just be nice to have it down to an exact recipe so the guys in the field do not have to tweak and modify.
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Old 04-23-2014, 10:02 PM   #5
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So, top off the 3.5 gallons bleach and soap with 1.5 gallons water and downstream away?

Since I switch to pressure tek down streamers I feel like i have not got my mix dialing in consistently. I use liquid pool bleach though and I do not think that quite hits 12%. It seems like I am using more bleach than I used to use for some reason. Probably just pushing more water through with the newer setup as well. I would just be nice to have it down to an exact recipe so the guys in the field do not have to tweak and modify.
Yes on your first question, Dean.

I know what you mean. Some guys will go as low as a gallon of 12% on light surface mold on vinyl. I don't want that kind of on-the-fly mixing, so the formula I ran with is a little stronger. The flow of your machine and the size of the downstreamer are all going to affect the final ratio. On some surfaces, especially moldy dryvit, you may need all "bleach" and no water.
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Old 04-24-2014, 01:01 AM   #6
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Yeah I guess so Bill. They've recently upped household bleach from 5% to 8%. Billed as Concentrated, it comes in smaller containers for the same price as the larger ones used to be.
Which reminds me, candy bars have been getting smaller and smaller and more expensive! The regular price is now $1.19 at Safeway for a regular size. What's up with that?!?!


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Old 04-24-2014, 01:16 AM   #7
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So what's the math on that mix Ken? 3.5 gals of 12% bleach and soap plus 1.5 gals water equals X% bleach concentrate. Where's my high school algebra when I need it?!
Who's got the answer?


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Old 04-24-2014, 06:04 AM   #8
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So what's the math on that mix Ken? 3.5 gals of 12% bleach and soap plus 1.5 gals water equals X% bleach concentrate. Where's my high school algebra when I need it?!
Who's got the answer?


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Too many variables to even worry about it, Damon. (different gpm machines, true % of sodium hypochlorite, how much hose on a reel, etc).

The perfect percentage is simply the one that works for the job.
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Old 04-24-2014, 04:11 PM   #9
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Too many variables to even worry about it, Damon. (different gpm machines, true % of sodium hypochlorite, how much hose on a reel, etc).

The perfect percentage is simply the one that works for the job.

Thanks Ken!!
I used straight 8% with some liquid Tide added today on a very dirty / mikdewy house and it cleaned up great. Love that 4-tip unit from pressure Tek!


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Old 04-24-2014, 05:50 PM   #10
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Thanks Ken!!
I used straight 8% with some liquid Tide added today on a very dirty / mikdewy house and it cleaned up great. Love that 4-tip unit from pressure Tek!


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Makes you think of all those years doing it the hard way.
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Old 04-24-2014, 07:49 PM   #11
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Wouldn't 5 gallons of 8% bleach be roughly stronger than 3 or 3.5 gallons of 12% plus water? Or is there some other benefit to the 12% I'm not aware of?
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Old 04-24-2014, 08:40 PM   #12
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Makes you think of all those years doing it the hard way.

Too many years!!!!


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Old 04-24-2014, 10:44 PM   #13
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Wouldn't 5 gallons of 8% bleach be roughly stronger than 3 or 3.5 gallons of 12% plus water? Or is there some other benefit to the 12% I'm not aware of?
In that example without doing the math.. I'm sure close enough. What if you need a stronger mix though? You have nowhere to go but change the method of application. There is also a cost factor. 3.5 gallons of 12% is less expensive than 5 gallons of 8%. There is a diminishing return in terms of storage time, safety, storage and degradation slope once you go past 15%.
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Old 09-18-2015, 02:35 PM   #14
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Don't spank me,the info here is great,well outdoor bio Clorox,a clear detergent works great,Man,for some reason after cleaning a house,it leave a clear film,that kills meldew for months, check me, if I'm wrong.love th stuff.
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Old 11-09-2015, 04:05 PM   #15
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Just to add another option - How about not using bleach at all?

Here is what a Sunshine Coast Pressure Cleaning company uses:

First we cover the area with our bio-degradable mould killer which unlike bleach, chlorine or acids will clean without causing damage to the surface and will not harm people, pets or plants.

Here are the results on aggregate


Thoughts?
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Old 11-09-2015, 06:27 PM   #16
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Here is what a Sunshine Coast Pressure Cleaning company uses:


Here are the results on aggregate


Thoughts?
The aggregate looks good.

The link sends me to a website for a company that provides pressure washing services. I don't see anything about what was used for the disinfection of mold or mildew. Please share what was used to make that aggregate look so good.
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Old 11-09-2015, 07:26 PM   #17
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Quote:
Originally Posted by Eugene View Post
Just to add another option - How about not using bleach at all?

Here is what a Sunshine Coast Pressure Cleaning company uses:

First we cover the area with our bio-degradable mould killer which unlike bleach, chlorine or acids will clean without causing damage to the surface and will not harm people, pets or plants.

Here are the results on aggregate


Thoughts?
Hard to say. What psi did they/you use to make the clean spot? Are they/you using hot water? I will tell you from 15 years of experience that quats or sodium percarbonate will not kill mold on concrete in any kind of reasonable time. There are times when we apply a 6% solution and still have to use up close pressure (1200 psi or so at the nozzle is all we go up to) or apply another coating of 6% bleach. As always, the right tool for the job in the hands of a pro for maximum efficiency. Bleach won't damage cured concrete but higher pressure will tear off a skim coat. Aggregate is easy to clean.
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Old 11-13-2015, 08:53 PM   #18
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I don't think I've ever run bleach through my machine.. I have a good size hudson sprayer that I've marked for quick fills, 3/1 kills everything I need it to. I give a side or two of the house a pass and by the time I'm coming back to wash all the black has turned yellow. It's an extra trip up and down but has never failed me!
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Old 11-14-2015, 08:44 AM   #19
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with a down streamer you never run bleach through your machine, and never have to use a ladder for the first four stories look into it, you my friend are chopping down a tree with with a ax, instead you could be using a chain saw. I know because I had that same hudson sprayer and did it that way for a long time.
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Old 11-14-2015, 09:01 AM   #20
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with a down streamer you never run bleach through your machine, and never have to use a ladder for the first four stories look into it, you my friend are chopping down a tree with with a ax, instead you could be using a chain saw. I know because I had that same hudson sprayer and did it that way for a long time.

For real man. I wish I had all the hours back I spent doing that!
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