I have hit this 4 to 5 percent SH and it has come about 80 percent cleaner but you can still see where the streaks where. What should I do to get the rest of? It’s kind of a concrete/ stucco surface. Dwell time was about 15 minutes between 3 coats.
if it just that spot? or all around?
and what surfactant are you using?
Usually I use elemonator but ran out and had to sub in some gain.
I’ve found that sometimes there will always be a light shadow left that I cannot remove. When bidding on a stucco or eifs job I always be sure to mention that there may be a light shadow remaining.
Probably BARC according to the cookbook.
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Could be oxydized paint runoff.
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I’ve seen similar stains or shadows on stucco house that had bad stains under window sills. I’ve had a few i couldn’t get perfect even with 12%SH.
I’ve dealt with these types of streaks before, and i either had to rinse and reapply, or straight mix from pump up worked. thankfully no issue yet.
I’ve only ran into streaks under older aluminum frame windows a couple times. Most houses I do are newer and vinyl. Aluminum brightener from a pump-up, minute or two dwell, then brush it and it came off each time. Just letting the acid sit there didn’t do much, I needed to brush it, but it came right off.
