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#1
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lichen on concrete paving slabs
Does anyone have a sucessful method to remove lichen from concrete
textured paving slabs. The lichen forms small black circular patches 1-3cm in diameter and looks unsightly. I have tried various chemicals, acids and detergents without success. Powerhosing works but it damages the surface of the slabs leaving rough, eroded areas. Best wishes Bill F |
#2
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lichen on concrete paving slabs
Ben wrote in message ...
Bill F wrote: Does anyone have a sucessful method to remove lichen from concrete textured paving slabs. The lichen forms small black circular patches 1-3cm in diameter and looks unsightly. I have tried various chemicals, acids and detergents without success. Powerhosing works but it damages the surface of the slabs leaving rough, eroded areas. Best wishes Bill F I used to have black spots on my concrete paving slabs (although I assumed it was mould, not lichen) and nothing would shift them. Like you, I tried all kinds of chemicals, acids and detergents, and resorted to abrasive techniques (wire brush - I don't have a pressure washer) which just ended up damaging the concrete. In the end, the solution was frustratingly similar to the very first thing I'd tried. Repeated application of neat *thin* bleach - not thick bleach! The thin stuff soaks into the concrete and kills the roots (or whatever it is that mould has), or at least that's my explanation. The thick stuff just sits on the surface and has no effect at all. Ben Thanks for your suggestion - I tried thin bleach today and it seems to work just like you said, one or two applications get most of it off. I've ordered 50 litres more from our local Tesco, at 28p for 2 litres it seems a bargain. If they sold it as patio cleaner they could probably make a killing. Thanks again for the advice Best wishes Bill |
#3
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lichen on concrete paving slabs
"Bill F" wrote in message m... Ben wrote in message ... Bill F wrote: Does anyone have a sucessful method to remove lichen from concrete textured paving slabs. The lichen forms small black circular patches 1-3cm in diameter and looks unsightly. I have tried various chemicals, acids and detergents without success. Powerhosing works but it damages the surface of the slabs leaving rough, eroded areas. Best wishes Bill F I used to have black spots on my concrete paving slabs (although I assumed it was mould, not lichen) and nothing would shift them. Like you, I tried all kinds of chemicals, acids and detergents, and resorted to abrasive techniques (wire brush - I don't have a pressure washer) which just ended up damaging the concrete. In the end, the solution was frustratingly similar to the very first thing I'd tried. Repeated application of neat *thin* bleach - not thick bleach! The thin stuff soaks into the concrete and kills the roots (or whatever it is that mould has), or at least that's my explanation. The thick stuff just sits on the surface and has no effect at all. Ben Thanks for your suggestion - I tried thin bleach today and it seems to work just like you said, one or two applications get most of it off. I've ordered 50 litres more from our local Tesco, at 28p for 2 litres it seems a bargain. If they sold it as patio cleaner they could probably make a killing. Thanks again for the advice Best wishes Bill ***** Here's an aside. My daughter went to splendid place in the Lake District hills to study water-colour painting . Another class were there to study lichen. It was their hobby. They were nice people but when they were all slowly walking around the sites where lichen abounded they cruised around on their hands and knees with a monocular in one eye and noses four inches from the targets. They were quite amusing to see but nevertheless were dedicated to the fancy. Doug. ***** |
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