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Old 16-03-2003, 10:20 AM
Dwayne
 
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Default 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.