[Bahr]

Well as a georgia certified landscaper. I can probly tell you hundreds of ways to kill Grass. But the best way for your cause would be regular fertilizer. Use either 10-10-10 or 10-15-20 or straight nitrogen (in some states/countries its illigal to buy pure with out a lincense, but any brand that has a high nitrogen count will work fine.) and just spell out the word with the fertilizer, make sure its pretty thick. Works best if the grass is dry and the fertilizer is allowed to set for a few hours without getting wet. the grass will green back up after about a month or two. And it will kill it over night. Trust me, that the main rule about nitrogen based fertilizer. make sure its spread thin and even and make sure you water it soon after spreading, if you dont it burns out leaves very fast.