Crab Grass- everything you need to know. Plus, some bonus footage of ye ole neighborhood bike ride. Here is Drive 75 DF for CrabGrass http://amzn.to/1Sw8XJZ This is the generic for Quinclorac and can be tank mixed (hand can) at a higher rate as revealed on the label.
Here is a decent weed control that will work well if your crab grass problem is not as advanced yet: http://amzn.to/1fWqTl6
This is my hybrid-organic lawn care treatment program. This is a fairly easy lawn care schedule to follow. Of course, the weather where you live may be a bit different than where I am here in Indiana, but the treatments will work pretty much anywhere in the country.