Hi guys. First off, let me say that I totally respect all of you organic guys because the amount of pollution from lawn chemical applications makes me sick. I don't use any kind of chemicals and I am not licensed to, either. I am also tired of weed whacking sidewalks and driveways, so, I am looking into concentrated vinegar for weed control. My question is, do you have to be licensed to spray it? I'm in Ohio. And I don't know if it is listed as a pesticide or not. Can anyone tell me what's up with it or point me in the right direction to find the information? Thanks!