Brand new smooth stucco has big rust colored stains from the oak tree above it after the rain. I’ve tried 3% SH, efflo, ebc, barc and how heading back to get more one restore. Nothing touched it really. Is it a lost cause or is there something else that may work? Efflo kind of worked. It’s only been like this for 3 days.
i used rust remover from local vendor on an identical situation
I tried F9 barc it didn’t do anything. That was my first go to as I thought it was rust
Hit it with hotter SH mix 5-6% and let it dwell longer. If it is organic it should clean i off. If all else fails, hire a painter to paint that area it as it is clean enough to paint now.
Update: went back and hit it with 100% undiluted efflo. The smooth stucco material is colored with integral mix so it’s not painted. Also, interestingly, agitation with a brush does not work. Rather, spray it on, as it dwells it pulls the stain from within the surface. It foams up and you can see the yellow from the stain come to the top of the foam. As it slides down the wall you can see it changing from stained to white. It does etch it but compared to the stain that is super obvious, it’s still acceptable. (But maybe not for everyone. I could see a super picky client demanding it be redone, which would cost thousands.) I’ll get more pics when I go back tomorrow.
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