Mold/mildew on stucco

JDhomeservices

JDhomeservices

New member
I have been doing a lot of stucco houses that have some mold/mildew so deeply ingrained into them that I can't seem to do anything to get it all off. Here is a picture of a wall AFTER I downstreamed undiluted 10% SH and 3 oz. Roof Snot in a 5er through a 4GPM machine. It's about 75 percent cleaner than it was when I started, but I can't seem to get the rest of. The paint is already starting to peel so I can't really use any pressure. I tried spraying I 50/50 mix of EBC on it, but that did not help. Any suggestions?

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Sorry, forgot picture.
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How many times did you downstream the house wash mix onto it?

How long did you let the mix dwell on the surface?

Do you get the SH by the drum? 1 gallon from stores? 5 gallon from suppliers?
 
Christopher said:
How many times did you downstream the house wash mix onto it?

How long did you let the mix dwell on the surface?

Do you get the SH by the drum? 1 gallon from stores? 5 gallon from suppliers?
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I downstreamed it 3x. I let the mix dwell for about 5-10 minutes. Just got the SH today from Gorman.

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Its not going anywhere.
 
There have been times where I had to apply it like 6 to 8 times on stucco and got it all out.

There have been times where hardly any of it came out at all, it was into the stucco.

I tell everyone upfront on Stucco and Drivit that there is a possibility of the stain being permanent so they know before I start so they don't expect it to be perfect when I am done. I had a shopping center last month where some parts came out like new and some would not come clean at all. They were prepared for the worst and relieved that they did not have to paint everything.

I told them that yearly washing will prevent this from happening again and the need for painting will be years later than if they don't wash yearly.

Sometimes I put some mix into a bucket and use a brush and apply it to the stubborn parts to see what is happening, if nothing at all with straight mix after a short dwell time, it is permanent.

You can only do so much if the property is neglected.
 
Premier Power Wash said:
i usually don't downstream stucco, use my fatboy with about a 20% SH mix and let it dwell 10-15 minutes
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What he said....use a roof mix through your pump. Walk away to the truck, check your phone, say hello to a hood walker, put out some door knockers, and come back and it will be gone or mostly gone. If mostly gone hit it repeat above..

OR....tell the customer, to get rid of it all, you may have to use some pressure....and they may lose paint in the process. Let them decide what they can do without most.
 
Yep, I would not downstream it on either use a stronger mix and directly apply it to the surface. With that small an area you could use a pump up sprayer or a little hand sprayer.
 
While I wait for my buffer tank to fill a bit when arriving at a new job, I usually walk around the house with a pump up sprayer with a 50/50 roof mix pre-treating spots like that prior to downstreaming my house wash mix. This usually takes care of the heavy stains.
 
"Red" said:
How are you getting the mix to "hang" that long?
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I'm wondering the same thing. I guess a little more surfactant would work if the mix didn't dry on the walls, and especially windows, in 5-10 minutes. I lived in Colorado for a couple years, and when I first moved there I couldn't believe how long it took for anything to dry. You could spill a glass of water or something on your driveway and it would be there for hours it seems like. Here it might be there 5 minutes. So I guess things like dwell time and amount of mold are different in different areas, although I hate to discount anyone's advice. But here in Florida, "give it 15 minutes dwell time" can be translated "wait until the mix dries on the house." Can you back me up on this, Red?

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Paul Kassander said:
Yep, I would not downstream it on either use a stronger mix and directly apply it to the surface. With that small an area you could use a pump up sprayer or a little hand sprayer.
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It wasn't a small area when I started. Their were stains like that halfway up the walls most of the way around the house.
 
I had a similar situation on stucco and painted cinderblock where the stains would not come off with downstreaming. After several applications I made a hotter mix in a pump up sprayer and applied. I think I was 50/50 SH and water with greenwash and it still took two applications but it did eventually come off. If it is small areas I would go with a pump up, large areas of stubborn grim I would use the dual pump.
 
JDhomeservices said:
I'm wondering the same thing. I guess a little more surfactant would work if the mix didn't dry on the walls, and especially windows, in 5-10 minutes. I lived in Colorado for a couple years, and when I first moved there I couldn't believe how long it took for anything to dry. You could spill a glass of water or something on your driveway and it would be there for hours it seems like. Here it might be there 5 minutes. So I guess things like dwell time and amount of mold are different in different areas, although I hate to discount anyone's advice. But here in Florida, "give it 15 minutes dwell time" can be translated "wait until the mix dries on the house." Can you back me up on this, Red?
Click to expand...

The house I cleaned last Friday (roughly 70-80' deep & 60' wide) was right on a lake and the wind was blowing in every direction, dried the walls in under 2 minutes. Had my helper continually misting the walls to keep them wet. The walls really weren't all that bad to begin with, the soffits and pool enclosure are what needed the most attention.

Wanna see what a breeze off a lake will get ya? Didn't matter which way I turned that wind would blow the mix right back on me.

Windy-Day-Front_zps27a1e2e3.png
Windy-Day-Back_zps2aae1a54.png

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The shirt looked almost new when I started the job.
 
"Red" said:
The house I cleaned last Friday (roughly 70-80' deep & 60' wide) was right on a lake and the wind was blowing in every direction, dried the walls in under 2 minutes. Had my helper continually misting the walls to keep them wet. The walls really weren't all that bad to begin with, the soffits and pool enclosure are what needed the most attention.

Wanna see what a breeze off a lake will get ya? Didn't matter which way I turned that wind would blow the mix right back on me.

Windy-Day-Front_zps27a1e2e3.png
Windy-Day-Back_zps2aae1a54.png

​

The shirt looked almost new when I started the job.
Click to expand...

Polyester like UnderArmour and Dickies khakis are the answer to that problem.

Pat Norman 663-316-7685
 
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