Use a general lawn weed killer. Use something like Weed B Gone. It will do the trick.
Save a few. The juice from the leaf is great for soothing mosquito bites. It's an old Cherokee remedy.
It will need to be a broad leaf weed killer.
It will need to be a broad leaf weed killer.
I believe Wal-Mart sells a spray that kills crab-grass and weeds. I would check with the Garden Dept. At your local Wal-Mart. Good-Luck.