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Here are two answers from Yahoo Answers:
If you have used the stuff for killing moss on your lawn, don't worry, it looks like hell now but it will fade. As the rain and the sun bleaches it, it will fade.In future, use Jeyes Fluid, that will kill the moss on your patio. It will smell like a pubs toilet for a day but it works.

To remove the stains from concrete etc., use a concentrated solution of citric acid (available from the homebrew department of larger chemists). The solution should be applied to the stains and left for half an hour, before rinsing off with water. Gloves should be worn when applying the solution and it is advisable to test a small area first. Avoid the mixture coming into contact with stainless steel or enamel. It is an acid, as the name suggests, and care is necessary, although there should be no problems provided you wear gloves and act sensibly.

14 years ago. Rating: 2
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