How to remove stains on limestone on the exterior of our N facing home

Peggy PryorDecember 29, 2013
Don't know if it's algae or mildew on the exterior of our house, easy way to remove on 2 stories
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boxshall
Concrete cleaner, mix with water like you would wash DIRTY floors. Apply to wet wall with heavy brush and rinse.
1 Like    Bookmark   Thanked by Peggy Pryor    December 29, 2013 at 5:33PM
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stidmama
Either algae or mildew requires a fairly narrow pH range. You might try spraying a light baking soda solution on the limestone in a less-conspicuous spot to see if it helps. I wouldn't try an acid (vinegar) solution because that could dissolve the limestone.
1 Like    Bookmark   Thanked by Peggy Pryor    December 29, 2013 at 5:36PM
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studio10001
I'd be inclined to apply oxygenated bleach and scrub brush, so that your soil isn't poisoned. Interested to hear what others have to offer, though.
1 Like    Bookmark   Thanked by Peggy Pryor    December 29, 2013 at 5:39PM
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hayleydaniels
Is it green, and on the north side? If so, it's moss. You might just try pressure washing it to start with and see if that helps. I live north of Seattle, and the last few winters have produced more than our fair share of moss. My husband just uses the pressure washer to get rid of it.

You can put Tide laundry detergent [the powder form] on your roof to prevent moss from growing on it.
1 Like    Bookmark   Thanked by Peggy Pryor    December 29, 2013 at 5:46PM
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