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I Have Always Found That.... Posted by Dodgeman on October 4th, 2002 12:15 PM In reply to Cleaning green-stuff off the drive & walkways by JG on October 4th, 2002 05:27 AM [Go to top of thread]
A mixture of TSP (tri sodium phosphate) and bleach in water to be a powerful cleaner for your type of problem. Much better than Bleach alone.
For prevention, I suspect a mild solution of copper sulfate would go a long ways. However, use caution. It may also kill grass or small shrubs.
Good Luck!
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