Does Wet & Forget work?

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I recently used Wet & Forget on some wood siding and haven't seen results, yet. I sprayed it on the house about a month ago and wanted to see if I should give it more time or do a second spraying. Thanks for your help. BTW, based on everyone's response I wanted to post before & after pics either here or on my sight (www.homerepairtutor.com).
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Wet & Forget
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