Sunday, August 14, 2011

I need help identifying what is causing this discoloration on my stucco exterior walls?

That's what is called efflorescence. It's caused by impuities in the stucco mix. You can try CLR or some kind of acid etch like muriatic acid. it will probably come back until all the impurities have leached out. Really hard to stop it, just try to keep it cleaned off

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