Black siding fallout? pt 1, 2, 3

Go get you some wire wheel cleaner. It’s an acid. Dilute about 2-1 and spray a section. May have to do a couple of coats with a couple of min in between Let sit a couple of minutes and then rinse. Try a section with 1 coat and then another beside it with 2 coats. Decent sized area, like 5*10 each.

I’m sensing at this point it may need repainting. All these brushes, chems, pads etc might just be delaying the inevitable.

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@dcbrock - Logan said it is vinyl siding Chris, so I do not think the customer would accept that option.

a magic eraser isn’t magic, it is just a melamine sponge. Have you seen that crappy white stuff that is pre drilled with holes that they sell at lowes and home depot for making shelves with, yep, melamine. Think about rubbing that on a house.

The more you know.

Everyone on here makes mistakes, except for the liars. Lessons you should have learned by now 1) always do a test spot 2) always use a surfactant 3) flash drying is a thing and you have to counteract it 4) proper rinsing techniques

Unless you’re willing to spend a significant amount of time, money, and effort on an uncertain fix, it might be time to repaint or replace and move on.

You can paint vinyl siding. It’s an option.

He has basically ruined the homeowners siding and should replace all of it, not try to paint it.


When I was developing a paint stripper I got a piece of old weathered painted wood. I mixed up about 10 different formulas and then applied exactly 3 drops in the middle of a circle with a number at the bottom. The number was tied to a formula in my notebook, so formula 1 might have been 25% caustic soda, formula 2 was 50% caustic soda, formula 3 was the leading paint stripper, then 4-10 were variations of my formulas. Some had more solvent than others, some were a combination of caustics and solvents….etc.

Anyway, I applied three drops in the first circle and set a timer for 10 minutes. At 10 minutes I sprayed it with water and did a hard wipe with a rag. This told me which products moved the paint, which products caused the wood to get fuzzy, which products acted like nothing was happening and it may as well have been water.

This is a very typical experiment to test out different variations on a known surface. The keys are to try them all on the same type of surface, so in your case both the spots that need to be cleaned and the spots that look fine. I would dip the toothbrush in the cup, take it out and make sure it’s not dripping much, and apply on the spot you are testing by doing exactly three circles with the brush (or whatever you think can sort of mimic what your system can do with a cleaner….then wait a typical dwell time and rinse well. Do not allow your rinsing to interfere with a current test circle or a new test circle. This means start at the lowest panel so if you wind up doing 40 tests you will always have unmolested samples above you.

This has to be quicker than pressure washing over and over and wasting chemicals.

That is how I would do the experiment, but option 2, you may just want to ask the homeowner the type of vinyl and the manufacturer if they know. You can phrase is very noncommittal like by saying “Hey, I was just wondering if you knew the brand of vinyl that is on this house or who put it up? Often times the manufacturer has some tips and tricks for cleaning their products that I may not know. Things unique to their product, I’d like to talk to them.”

Be sure to mention the color of the vinyl when you speak to them. I suspect they will say it is not compatible with bleach (SH).

Option 3 is you get new siding for that side of the house and see if you can swing it without an insurance claim.

Hope one of these works out for you!

Just an idea, have you tried cleansol bc as though you were doing oxydation removal?

Probably true, and this is one of those things that insurance will quite possibly not cover if so… one of those “you as a professional should have known better” scenarios.

Also worth adding to the test spot list

@JAtkinson -great idea Jason. Looking at the photos he posted it indeed looks like the bleach dried on the siding. If that is the case, as our resident chemist suggests the siding may be indeed burned. Not even a 2 step cleaning would fix that, my thinking anyway.

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Is this like the final saga? All parts complete in chronological order?

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ROFL. Yes, and the 4k version comes out next week.

Haha :rofl: I’ll come in with the finale soon than later. Won’t leave it end on a cliffhanger


Thank you for the knowledge and support. Mistakes are all a part of learning yessir

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Did you try the acid on a spot yet?

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