Home |
Search |
Today's Posts |
#1
|
|||
|
|||
removing black spots from concrete path
A load of black circles about the size of a penny have appeared all over
my concrete garden path, obviously some kind of mould or fungus or something. NOTHING seems to be able to get rid of them. Ordinary potassium hydroxide patio cleaner, applied with a good stiff brush, has no effect. Bleach, even applied neat with a stiff brush, has no effect. I now have a path that looks cleaner than it did when it was new, but the black spots are still there. Anyone able to suggest anything? Incidentally, I've been looking around the neighbourhood and nobody else has these, in fact I've never seen them before anywhere. Everyone else's concrete paths have, to varying degrees, a uniform layer of black grime that doesn't look too bad because its even, whereas the contrast I have between clean concrete and black circles is rather unsightly. Any suggestions? |
#2
|
|||
|
|||
removing black spots from concrete path
"ben" wrote in message ... A load of black circles about the size of a penny have appeared all over my concrete garden path, obviously some kind of mould or fungus or something. NOTHING seems to be able to get rid of them. Ordinary potassium hydroxide patio cleaner, applied with a good stiff brush, has no effect. Bleach, even applied neat with a stiff brush, has no effect. I now have a path that looks cleaner than it did when it was new, but the black spots are still there. Anyone able to suggest anything? Incidentally, I've been looking around the neighbourhood and nobody else has these, in fact I've never seen them before anywhere. Everyone else's concrete paths have, to varying degrees, a uniform layer of black grime that doesn't look too bad because its even, whereas the contrast I have between clean concrete and black circles is rather unsightly. Any suggestions? You could try a strong solution of Caustic soda or power jet wash if you have one but I don't think you have otherwise you would have used it. Andy |
#3
|
|||
|
|||
removing black spots from concrete path
"ben" wrote in message ... A load of black circles about the size of a penny have appeared all over my concrete garden path, obviously some kind of mould or fungus or something. NOTHING seems to be able to get rid of them. Ordinary potassium hydroxide patio cleaner, applied with a good stiff brush, has no effect. Bleach, even applied neat with a stiff brush, has no effect. I now have a path that looks cleaner than it did when it was new, but the black spots are still there. Anyone able to suggest anything? Incidentally, I've been looking around the neighbourhood and nobody else has these, in fact I've never seen them before anywhere. Everyone else's concrete paths have, to varying degrees, a uniform layer of black grime that doesn't look too bad because its even, whereas the contrast I have between clean concrete and black circles is rather unsightly. Any suggestions? ============== If you don't mind a rather wayout suggestion try wallpaper paste if you have any left over from your last decorating job. Modern pastes usually contain a fungicide and it might just give you some indication of what you're dealing with. I've no idea if it will work but it's worth a try. Alternatively look in your local Garden Centre for a proprietary garden fungicide. Cic. |
#4
|
|||
|
|||
removing black spots from concrete path
"wanderer" wrote in message ... "Andy" wrote in message ... "ben" wrote in message ... A load of black circles about the size of a penny have appeared all over my concrete garden path, obviously some kind of mould or fungus or something. snip You could try a strong solution of Caustic soda or power jet wash if you have one but I don't think you have otherwise you would have used it. Pressure wash is unlikely to work on these spots. I have a few on some of the slabs around my pool, and whilst an annual spring pressure wash will remove most of the accumulated dirt and crap from the slabs, it doesn't touch these spots. As Ben says, you're left with slabs that are nice and clean with the spots standing out even more. Yours can't be doing it's job then A 100 psi can take paint of window sills, My backyard was covered in all sort of dirt, moss, oil stains fungi, when I had finished the concrete was gleaming. Andy |
#5
|
|||
|
|||
removing black spots from concrete path
Try a toilet bowl cleaner or shower cleaner that contains acid. Put it on
the concrete for varying lengths of time and check its progress. If it is a fungus, acid will usually get it out. Be sure and rinse it all off when you are finished. Good luck. Dwayne "Cicero" wrote in message ... "ben" wrote in message ... A load of black circles about the size of a penny have appeared all over my concrete garden path, obviously some kind of mould or fungus or something. NOTHING seems to be able to get rid of them. Ordinary potassium hydroxide patio cleaner, applied with a good stiff brush, has no effect. Bleach, even applied neat with a stiff brush, has no effect. I now have a path that looks cleaner than it did when it was new, but the black spots are still there. Anyone able to suggest anything? Incidentally, I've been looking around the neighbourhood and nobody else has these, in fact I've never seen them before anywhere. Everyone else's concrete paths have, to varying degrees, a uniform layer of black grime that doesn't look too bad because its even, whereas the contrast I have between clean concrete and black circles is rather unsightly. Any suggestions? ============== If you don't mind a rather wayout suggestion try wallpaper paste if you have any left over from your last decorating job. Modern pastes usually contain a fungicide and it might just give you some indication of what you're dealing with. I've no idea if it will work but it's worth a try. Alternatively look in your local Garden Centre for a proprietary garden fungicide. Cic. |
#6
|
|||
|
|||
removing black spots from concrete path
On Sat, 15 Mar 2003 14:24:32 +0000, ben wrote:
A load of black circles about the size of a penny have appeared all over my concrete garden path, obviously some kind of mould or fungus or something. NOTHING seems to be able to get rid of them. Ordinary potassium hydroxide patio cleaner, applied with a good stiff brush, has no effect. Bleach, even applied neat with a stiff brush, has no effect. I now have a path that looks cleaner than it did when it was new, but the black spots are still there. Anyone able to suggest anything? Incidentally, I've been looking around the neighbourhood and nobody else has these, in fact I've never seen them before anywhere. Everyone else's concrete paths have, to varying degrees, a uniform layer of black grime that doesn't look too bad because its even, whereas the contrast I have between clean concrete and black circles is rather unsightly. Any suggestions? There used to be an diesel Engine cleaner called "gunk" that is a petroleum based liquid that will remove just about anything stuck to anything.... |
#7
|
|||
|
|||
removing black spots from concrete path
"Andy" wrote in message
... "wanderer" wrote in message ... snip You could try a strong solution of Caustic soda or power jet wash if you have one but I don't think you have otherwise you would have used it. Pressure wash is unlikely to work on these spots. I have a few on some of the slabs around my pool, and whilst an annual spring pressure wash will remove most of the accumulated dirt and crap from the slabs, it doesn't touch these spots. As Ben says, you're left with slabs that are nice and clean with the spots standing out even more. Yours can't be doing it's job then A 100 psi can take paint of window sills, My backyard was covered in all sort of dirt, moss, oil stains fungi, when I had finished the concrete was gleaming. That's rather presumptuous of you! As it happens my PW works fine, but the spots seem to have some depth, as though they have etched into the slabs. |
#8
|
|||
|
|||
removing black spots from concrete path
"Dwayne" wrote in message ... Try a toilet bowl cleaner or shower cleaner that contains acid. Put it on the concrete for varying lengths of time and check its progress. If it is a fungus, acid will usually get it out. Be sure and rinse it all off when you are finished. Good luck. Dwayne "Cicero" wrote in message ... "ben" wrote in message ... A load of black circles about the size of a penny have appeared all over my concrete garden path, obviously some kind of mould or fungus or something. NOTHING seems to be able to get rid of them. Ordinary potassium hydroxide patio cleaner, applied with a good stiff brush, has no effect. Bleach, even applied neat with a stiff brush, has no effect. I now have a path that looks cleaner than it did when it was new, but the black spots are still there. Anyone able to suggest anything? Incidentally, I've been looking around the neighbourhood and nobody else has these, in fact I've never seen them before anywhere. Everyone else's concrete paths have, to varying degrees, a uniform layer of black grime that doesn't look too bad because its even, whereas the contrast I have between clean concrete and black circles is rather unsightly. Any suggestions? ============== If you don't mind a rather wayout suggestion try wallpaper paste if you have any left over from your last decorating job. Modern pastes usually contain a fungicide and it might just give you some indication of what you're dealing with. I've no idea if it will work but it's worth a try. Alternatively look in your local Garden Centre for a proprietary garden fungicide. Cic. I managed to remove mould spot on paving with steam. I used a wallpaper remover to steam the slabs, The flat plate of the steamer was ideal, if a little boring but the mould eventually lightened in colour and lost its grip on the paving. A quick blast from a pressure washer then removed the mould. I expect it will return after a while, but I'll be waiting..... with the steamer. Smudge |
#9
|
|||
|
|||
removing black spots from concrete path
Well, I tried a fungicide (dialkyldimethyl ammoniumchloride), or
'biocide' as they call it, which claims to work on fungi, mould, moss, lichen, mildew and algae. Left on for 3 days then washed off as directed. From all the warnings on the bottle it looks like nasty stuff - shame the mould didn't seem to think so, its doing just fine :-( |
#10
|
|||
|
|||
Quote:
|
#11
|
|||
|
|||
Quote:
|
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
smashing up a concrete path | United Kingdom | |||
black spots, Black Spots, BLACK SPOTS!!!!bbbbbblllllllaaaaacccckkkkkk ssspp | Roses | |||
black spots, Black Spots, BLACK SPOTS!!!!bbbbbblllllllaaaaacccckkkkkk ssspppOOOTTTSSSS!!!!!! | Roses | |||
black spots, Black Spots, BLACK SPOTS!!!!bbbbbblllllllaaaaacccckkkkkk | Roses | |||
Removing algae from concrete path and slabs? | United Kingdom |