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Red On Concrete.

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JoJo88 | 17:59 Tue 10th Nov 2015 | Home & Garden
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The concrete built border wall at the front and one side of the house has started turning red. There's also 2 ornamental columns with sphere's on top that are turning red as well. When I rubbed the red with a tissue it was a yellow shade that came off. My neighbour said the people who had the house before me had the wall built in the 80's. Answers welcome.

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It sounds like it could be 'Red Algae', probably brought on by recent dull wet weather.
You should be able to get rid of it with some patio cleaner from a hardware store or garden centre.

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Red On Concrete.

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