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I know a guy who suggests the following.
1: Mow the lawn really short.
2: Water it so it starts growing good.
3: Once the crab grass has grown up faster than the lawn grass and is clearly taller... use a sock pulled over a hockey stick and dipped in roundup, and swipe it (walking backwards to avoid foot prints) on only the taller crab-grass.
He claims it works good.
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