I have a short brick garden wall with white coping stones on top. The coping stones have become discoloured with some mildew type growth. How can I clean them without damaging the stones?
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15 years ago
Cleaning white coping stones
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15 years ago
Bleach followed by a pressure washer
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15 years ago
The message from Kooky45 contains these words:
Bleach? Armillatox?
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15 years ago
A pressure washer might well damage the stones.
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15 years ago
on 23/04/2008, Kooky45 supposed :
Paint some bleach on during a long dry period and leave it on as long as possible, then pressure wash. I think anti-freeze might also be effective, we have an especially clean mark on our concrete which lasted for several years after a spill from a car radiator.
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15 years ago
Not if a decent one, with appropriate nozzle used properly.
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15 years ago
Pressure washers damaging everything from car paint to stomework is a complete myth. I sold the buggers for 30 years and rarely if ever found they damaged anything.
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15 years ago
That'll be why Marley specifically advise _against_ using power washers to clean their roof tiles, then?
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15 years ago
While in situ? Water in the roof space is bad so they would advise against it even if the tiles are unaffected they will leak or even be blown off the roof. No nails in them ya know.
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15 years ago
That's interesting. I can't imagine why anti-freeze would do that but it's worth a little experiment on my patio I think. I also don't understand why it is that where the wife puts the pressure cooker outside to release the steam there is also a nice clean area where the base sits. Can't be the steam as that goes upwards. Heat prtesumably
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15 years ago
First time I used one it damaged some car paintwork.
After that I got better at modulating the pressure.
when washing stonework, be careful. The small particles of dusty stone make excellent abrasives.
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15 years ago
The message from "dennis@home" contains these words:
No, it's nothing to do with water in the roof space, or displacement. They specifically mention damage done by power washers (they've made some changes to their website, and I can't locate the statement that I know exists).
What I do know is that anyone enquiring of Marley how to clean their roof tiles are referred to my company. We get a fair bit of our work through their referrals, simply because we do not use power washers - ever!
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15 years ago
Taking stickers off cars, however...
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15 years ago
That's a feature, not a bug.
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15 years ago
So how do you claen roof tiles?
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15 years ago
Ass covering or general ignorance IMO. No way can a HPC damage a roof tile.
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15 years ago
Put a copper strip along the top. I wonder where I can obtain those.....
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15 years ago
I've caused damage with one - great fun :-)
Mary
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15 years ago
Why do you want them white?
Some people go to great lengths to create such a patina ...
Mary
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15 years ago
Better tall that to the man in Fleet, whose roof we sorted this this week, after he let some cowboys on his roof with a pressure washer, then!