Crabgrass

I have discovered crabgrass growing inside our house. We had this same problem 2 years ago.
It has some how found it's way inbetween the cement foundation and the side of the house. The last time this happened, the owners sent a guy out who came and cleaned the area of the crabgrass and put down dirt, a new plastic tarp, and then bark ontop of it. Plus, he sprayed industrial strength grass killer. That seemed to do the trick for the 2 summers, until now. I was not "green" back then. Now that I'm somewhat "green" and have a kid to worry about playing in the area (even though she doesn't play in the back yard yet) I want to use more natural stuff to get rid of it, but at the owners cost since it is coming into the house again. I did some research and found this site: http://landscaping.about.com/od/weedsdiseases/qt/kill_crab_grass.htm I like how at the bottom of the article it says, "A great organic "weed and feed" product is corn gluten. It will suppress crabgrass germination, while fertilizing your lawn." Now to find corn gluten, and a whole bunch of it!