Still think it’s dirt or solution left over from the sills. Only thing that really makes sense. The heviest parts are right under where the drain holes would be for the sills.
Don’t disagree, what it looked like to me too. Just can’t figure out why so much trouble getting rid of. @h2oteks - you gone back yet to get fixed?
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Where are you located? This is a stretch, but if you’re in one of those areas that has that “rusty dirt” that could stain it.
Maybe not enough rinsing and some metal window part was sitting in SH… Voila! Rust stains.
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I don’t know about you guys in U.S. but we’ve got some metal screens here in Europe.
Yeah, we have some of those. But there has to be more to it or this type of staining would be much more common.
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I need to know what got it off lol
Than,s for the feedback everyone. I don’t know why I didn’t think of this the first time, probably just the end of a long hot day, but it was rust caused by metal window fins behind the siding. Came off in two seconds with the right method.
Thanks, for all the good input.
Except for the comment about dirty sills, not to pick on that one, but of course it was more than that otherwise we would be completely incompetent at house washing 
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What method did you use?
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What did the right method end up being
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Iron out took 90% of it, renew one polished it out nicely.
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Isn’t iron out just oxalic?
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I guess that would be a no then .
lake from front home and tried a house wash mix and even brushed some on the side of the house not much luck at all. It’s a fake shake siding and when I rub it orange residue comes off trying oxcylic when I go up there again but any other suggestions would be helpful. The siding on the A frame part is about 10 yrs old and other part is 3 yrs old.
I always assumed oxalic too
Don’t know how to fix it. I’ve replaced it before. We don’t wash vinyl shakes anymore
If it’s vinyl then the orange residue should be oxidation.
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Thanks for the guidance on possibilities. One me thing to try before I walk away from this one.
To DW: bar keepers friend is about 10% oxalic powder with feldspar…maybe test a tiny inconspicuous spot first with microfiber cloth? The feldspar is like a polish…the overall scarier part of hotting this thing harder is getting some spots back to original color while other spots arent so lucky and you end up with a calico a frame section. Not too sure just trying to help brainstorm.
