Removing algae from concrete path and slabs?
"Nick Maclaren" wrote in message
...
In article ,
david wrote:
Try using Formaldehyde.. horrible to use but will do the job.
Try a a stiff broom, some sharp sand, some water and possibly a squirt
of washing up liquid. It works a dream and isn't horrible to use.
Why does everyone think in terms of toxic chemicals?
I was thinking chemicals. No particular requirement for toxicity.
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Tumbleweed
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