Fell for the vinegar and dish soap weed killer hoax. Need something to mix into my sprayer to kill weeds in hard to reach places or just to spray and forget. Neighbors all have dogs and cute friendly outdoor cats so I don't want to spray anything chemically and toxic. What can I mix into my sprayer that is natural that will kill weeds or the grass where ever I spray it? Is there anything I can mix with 30% hydrogen peroxide for a little extra kick? 30% hydrogen peroxide burns if it touches your skin, I'm guessing it will kill weeds too? What else can I add to it or any other suggestions?