What is the best way to get rid of the crabgrass in my lawn?

Best way is a preemergent spray in early Spring. Once it germaninates its tough to kill, Orthoo and Bayer as well as others do make crabgrass killer but they take several apps. Try the preemergent spray or filtilizer with it already mixed in.

There is a new chemical out thet removes crab grass and weeds, It is available at BI-mart