Re: cleaning concrete blocks

Posted by rgvtx on March 29, 2007 at 20:09:40 from (64.12.116.14):

In Reply to: cleaning concrete blocks posted by BSer on March 29, 2007 at 16:30:07:

My first thought was to go ahead and use them as they are and once they are up and the mortar has had time to dry, then spray them with some bleach and water mixture. But, if you can't get to both sides that won't work. The pressure washer will clean them up, but as you know you won't kill the mildew. Bleach is the only way I know to kill it safely. Muratic Acid is great for cleaning concrete and brick, but is far from safe. Any chemical that gives off green smoke is a bit scary to me although I have used it for removing mortar from brick, cleaning some stains on a driveway and even to clean out a gas tank one time. The bleach mixture I recall using was one cup to a gallon of water. Since your doing a lot, I would use a pressure washer with a siphon tube to draw the bleach. You will use the soap tip on the wand for the bleach, then switch to a smaller tip but not too small. Try a 40 first and if the stuff is stubborn you can go all the way down to a 15 degree but just don't get too close. Brick is usually very porous but since you have some aged brick it may not be as bad as the brick we buy these days.
Just imagine if you had stored lumber all these years? What little you would have left by now that the termites hadn't eaten would have mildew on it too!
Ain't living in the south great?
RGVTX, Tip Of Texas

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