I'm taking a shot in the dark but re paint the wall might be easier?
Have Had this to contend with once. Water, House wash [more soap than hypo], brush and elbow grease. Because it is organic it will re-hydrate. I found that I had to keep it wet and just keep on scrubbing it. A short, stiff bristle brush worked best. In the case I had to deal with there was no residual staining on the cladding
Cleansol BC two applications 4:1
then wash it right off.
best deal I've seen on oxyclean is at sams club. it makes sense that it would work an egg is technically 1 huge organic cell and oxyclean is basically hydrogen peroxide (if I'm not mistaken) hydrogen peroxide cleans organic matter better than anything I've ever seen. ive watched oxyclean bubble and eat away algae (anther organic) all theory, good luck
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best deal I've seen on oxyclean is at sams club. it makes sense that it would work an egg is technically 1 huge organic cell and oxyclean is basically hydrogen peroxide (if I'm not mistaken) hydrogen peroxide cleans organic matter better than anything I've ever seen. ive watched oxyclean bubble and eat away algae (anther organic) all theory, good luck
Sent from my DROID RAZR using Tapatalk