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Patio stain problems
Hello,
My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). The only effective method I've found is to scrub the slabs with thick, neat bleach, leave it for several hours, then rinse it off. It is messy and time-consuming , requires an awful lot of bleach (about 1 litre of bleach per sq. metre), and kills the grass at the edge of the lawn (though it soon recovers). The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Thanks KK |
Patio stain problems
"KK" wrote in message ... Hello, My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). The only effective method I've found is to scrub the slabs with thick, neat bleach, leave it for several hours, then rinse it off. It is messy and time-consuming , requires an awful lot of bleach (about 1 litre of bleach per sq. metre), and kills the grass at the edge of the lawn (though it soon recovers). The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Thanks KK How about sealing the slabs with something after you've cleaned them? Look for concrete sealant via goggle......... jenny |
Patio stain problems
In article , KK
writes My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). What about Armillatox - under the new regs this is now what it's labelled to do anyway. Colin -- Colin Brook - Winchester (UK) Tel:+44(0)1962-714030 Fax:+44(0)8701641293 Mobile:07976258703 |
Patio stain problems
The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Is it out of the question to seal it with a concrete paint? I used to do my factory floors with some quite good stuff. I believe it was by a company called Watco. Comes in all sorts of colours, wears quite well. Of course it depends on where it is and how you use the patio as to whether it would be aesthetically pleasing to paint it. Mike -- H.M.S.Newfoundland Association Reunion Hayling Island April 23rd - 26th Royal Naval Reunion Eastbourne May 7th - 10th H.M.S.Collingwood Association Reunion Bracklesham Bay May 21st - 24th Nat.Service (RAF) Assoc. Cosford Parade / Social Weekend 25th - 28th June |
Patio stain problems
:-))
http://www.watco.co.uk/ -- H.M.S.Newfoundland Association Reunion Hayling Island April 23rd - 26th Royal Naval Reunion Eastbourne May 7th - 10th H.M.S.Collingwood Association Reunion Bracklesham Bay May 21st - 24th Nat.Service (RAF) Assoc. Cosford Parade / Social Weekend 25th - 28th June |
Patio stain problems
"KK" wrote in message ... Hello, My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). The only effective method I've found is to scrub the slabs with thick, neat bleach, leave it for several hours, then rinse it off. It is messy and time-consuming , requires an awful lot of bleach (about 1 litre of bleach per sq. metre), and kills the grass at the edge of the lawn (though it soon recovers). The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Thanks KK How about sealing the slabs with something after you've cleaned them? Look for concrete sealant via goggle......... jenny |
Patio stain problems
In article , KK
writes My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). What about Armillatox - under the new regs this is now what it's labelled to do anyway. Colin -- Colin Brook - Winchester (UK) Tel:+44(0)1962-714030 Fax:+44(0)8701641293 Mobile:07976258703 |
Patio stain problems
The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Is it out of the question to seal it with a concrete paint? I used to do my factory floors with some quite good stuff. I believe it was by a company called Watco. Comes in all sorts of colours, wears quite well. Of course it depends on where it is and how you use the patio as to whether it would be aesthetically pleasing to paint it. Mike -- H.M.S.Newfoundland Association Reunion Hayling Island April 23rd - 26th Royal Naval Reunion Eastbourne May 7th - 10th H.M.S.Collingwood Association Reunion Bracklesham Bay May 21st - 24th Nat.Service (RAF) Assoc. Cosford Parade / Social Weekend 25th - 28th June |
Patio stain problems
:-))
http://www.watco.co.uk/ -- H.M.S.Newfoundland Association Reunion Hayling Island April 23rd - 26th Royal Naval Reunion Eastbourne May 7th - 10th H.M.S.Collingwood Association Reunion Bracklesham Bay May 21st - 24th Nat.Service (RAF) Assoc. Cosford Parade / Social Weekend 25th - 28th June |
Patio stain problems
"KK" wrote in message ... Hello, My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). The only effective method I've found is to scrub the slabs with thick, neat bleach, leave it for several hours, then rinse it off. It is messy and time-consuming , requires an awful lot of bleach (about 1 litre of bleach per sq. metre), and kills the grass at the edge of the lawn (though it soon recovers). The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Thanks KK How about sealing the slabs with something after you've cleaned them? Look for concrete sealant via goggle......... jenny |
Patio stain problems
In article , KK
writes My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). What about Armillatox - under the new regs this is now what it's labelled to do anyway. Colin -- Colin Brook - Winchester (UK) Tel:+44(0)1962-714030 Fax:+44(0)8701641293 Mobile:07976258703 |
Patio stain problems
The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Is it out of the question to seal it with a concrete paint? I used to do my factory floors with some quite good stuff. I believe it was by a company called Watco. Comes in all sorts of colours, wears quite well. Of course it depends on where it is and how you use the patio as to whether it would be aesthetically pleasing to paint it. Mike -- H.M.S.Newfoundland Association Reunion Hayling Island April 23rd - 26th Royal Naval Reunion Eastbourne May 7th - 10th H.M.S.Collingwood Association Reunion Bracklesham Bay May 21st - 24th Nat.Service (RAF) Assoc. Cosford Parade / Social Weekend 25th - 28th June |
Patio stain problems
:-))
http://www.watco.co.uk/ -- H.M.S.Newfoundland Association Reunion Hayling Island April 23rd - 26th Royal Naval Reunion Eastbourne May 7th - 10th H.M.S.Collingwood Association Reunion Bracklesham Bay May 21st - 24th Nat.Service (RAF) Assoc. Cosford Parade / Social Weekend 25th - 28th June |
Patio stain problems
"KK" wrote in message ... Hello, My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). The only effective method I've found is to scrub the slabs with thick, neat bleach, leave it for several hours, then rinse it off. It is messy and time-consuming , requires an awful lot of bleach (about 1 litre of bleach per sq. metre), and kills the grass at the edge of the lawn (though it soon recovers). The treatment has to be repeated every year. Does anyone have any better ideas or suggestions? Thanks KK How about sealing the slabs with something after you've cleaned them? Look for concrete sealant via goggle......... jenny |
Patio stain problems
In article , KK
writes My patio (about 25 sq metres) is made of bog-standard concrete slabs laid about 20 years ago. I have a problem with black stains on the slabs. The stains are roughly circular, about the size of a small coin, and very difficult to remove. I suspect they are caused by a fungus or mould in the slab itself, rather than on the surface. I've tried patio cleaner solution from a DIY / Garden centre (expensive and ineffectual). I've tried blasting the slabs with a high-pressure water jet (shifts the surface dirt nicely, doesn't affect the stains). I've tried scrubbing with a broom and a variety of scouring / cleaning powders & liquids (Ajax, Flash, Jif etc). What about Armillatox - under the new regs this is now what it's labelled to do anyway. Colin -- Colin Brook - Winchester (UK) Tel:+44(0)1962-714030 Fax:+44(0)8701641293 Mobile:07976258703 |
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