It’s great for fallout. I use a locally made aluminum brightner.
Update
Got the chance to go back and do my first oxidation removal. Customer was over the moon, I am pretty happy, but if you look really closely you can still see some staining. House is kinda on a corner with this side exposed to everyone driving/walking by so now as they go by it isn’t nearly as noticeable and that was the objective.
I used BC Cleansol - diluted 4:1 first as directions state. Then I DS’d onto the siding. Let set 5 minutes, DS’d a second time, let set another 4 minutes and still saw some oxidation. Took my green 270 degree gutter scrubbing brush and brushed quickly while side of home (7-8 minutes) then rinsed twice. This was all done yesterday evening with the air temps around 45/50 degrees out. Came back around lunchtime today and here’s the results:
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Nice work! Now I can see how it actually turns out, lol. I’m pretty sure when the oxidation gets that bad, that the surface is being eaten away, so it will never look “like new”. Like when you let gutters go for too long, you’re pretty much left with repaint or replace…
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Looks good. Should have tried the acid. Using a brush never a good thing, lol.
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Ric, you know I have to do things the hard way! 
I might have been able to white tip it and had decent results, but after the second round of spray sitting on there for a few minutes I didn’t see much change. But brushing it was super easy with the BC Cleansol. Significant difference between that and brushing it with just normal SH house mix.
I’m sure
Nice job and excellent post. You definitely helped countless guys/gals who will have a similar problem.
You think a pump sprayer or 12v with a higher concentration would have got the spots you had to brush?
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Unsure as I’m still new to this process. I had originally planned on 12v-ing it onto the siding, but the dilution process was going to be another step or so to complete. It very well might have been better/easier - I’ll have to experiment at some point in time in the future. I only have 50 ft of soft wash hose and 150 ft of DS hose. I had to park curbside for this wash as I was also doing the driveway at the same time - normally I park in the driveway for most of my house washes.
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We’ve got a local guy that came by the shop last month. We’re going to connect and do that process on his house when it warms up. I’ll make sure we get before & after pics this time too. I know we didn’t brush the first time, or they would not have been so excited about it afterwards, lol.
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Wash like normal, apply cleansol bc, apply a second coat of cleansol, rinse, brush the oxidation that doesn’t come off. Super easy process once you do it a couple of times. Also works well with vinyl shutters. Just have to make sure it is warm enough and you don’t let the apps dry before rinsing.
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Another oxidation removal job I did yesterday. Customer recently had another house washer out there and although they got most of the green stuff off the side of the house, they also got quite a bit of the oxidation as well - just not uniformly.
I used BC Cleansol again, diluted 4:1 (water:cleaner) and then downstreamed it through the pressure washer. Applied first application, let set about three minutes, then applied second application. After another three minutes or so I rinsed with light pressure. This worked well on three sides of the home, but the rear of the home I had to lightly brush to get the results I wanted.
Weather- hot, mid 90F, lots of sun.
Customer was blown away with results and eagerly paid.
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We’re finding this to be a common thread too…
Looks great!
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Looks awesome!
Looks great. I guess I don’t understand the dilution. If you dilute 4:1 and then downstream it aren’t you diluting again? I’m trying to figure out how to batch and 12v the mixture, dwell, reapply and rinse. I could have some happy folks here in N Ga.
Thank you for sharing! Great work!
@jaycrop
Correct, I am diluting it even further by downstreaming it. 12v application is absolutely do-able, you just have to cut it again before you apply it. I don’t remember the additional dilution ratio for 12v, but it can be found on their website. I choose downstreaming because my 12v set up is very limited, with only about 50-ft of hose length.
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Thanks Thomas - I should have checked their site first - sorry for my laziness. It turns out that 4:1 dilution is recommended and then it’s recommended that down streaming (with a dilution of 10:1 for dirty, or 20:1 for light stains) is done. This tells me that a gallon of Cleansol BC is actually 5 gallons to begin with and then is should be diluted further 10:1 before being applied with a 12 volt unless down-streaming with a pressure washer. So that’s ~28oz to 10 gallons of water if I did the math correctly (1280oz / 32oz = .025).
(I would imagine that the reason for them recommending dilution this way is because you would run out of 32 ounces fluid pretty quickly down-streaming from a container and it may be difficult for the siphon tube to suck it all up from that container - at least that’s what this old man’s mind thought of 
)
This is taken from their website:
Dilutions
First, dilute Cleansol BC 4 parts water to 1 part
Cleansol BC to make ready to use then follow the
dilution ranges listed below.
• 10 parts water to 1 part Cleansol BC for difficult
cleaning
• 20 parts water to 1 part Cleansol BC for light soil
• Undiluted for gutters and down spouts
Note: Dilutions will vary based on the severity of stain
and type of surface.
Coverage Rates
Coverage rates with Cleansol BC will vary from
100-250 sq. ft. per gallon depending on the surface
porosity, texture, ambient temperature, craftsmanship,
and severity of staining.
Application Instructions
- Pre-wet the surface (do not saturate) with water
before applying Cleansol BC. - For best brushless results, apply Cleansol BS with
a pressure washer - upstream or downstream or
with a low pressure applicator. - Cleansol BC requires two quick applications,
which leads to complete soil release most of the
time. Do not rinse between applications.
Rinsing
For brushless results, rinsing requires pressure
washer impact. Proper rinsing techniques determine
the final look and quality of the job. A thorough rinse
job is always recommended; however, our chemistry
never requires flooding the surface. Pressures that
mark the surface should be avoided. When in doubt,
follow the manufacturers recommended P.S.I. for the
substrates. Do not use a zero-degree nozzle.
Caution: Do not allow the product to dry on a
surface.
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