Originally Posted by reggie747 Try sodium hypochlorite, works wonders. Just used up 4 ltrs on my monoblock driveway - it's now about £33 per 4ltrs. Dilute from 14% by vol to around 10% for use, and make sure if spraying it, that you clean off the pump - as it corrodes metals. Don't get any on your clothes - it bleaches where it touches.
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