I have no experience with this, K Kflowers , as I never buy Dawn. I leave most creatures be as long as they are not putting my loved ones or me in danger. If they're outside living their lives, that's cool with me. Widows do get dispatched, though, wherever I find them. I whack 'em. Not proud of it, but that's what I have to do to ensure we're safe. When we moved here, my ex cleared the garage and bombed it as it was full of Widows.tarasgirl06 We use Dawn dish washing liquid about 3/4 to 1/4 water in spray bottles to kill wasps and the like. It gives you a good distance, brings them down fairly quickly and won't hurt the cats. My car did have a floral scent (got the pink version) for about a month, but the wasp was dead. Do you think it would work with the Black Widow Spiders, which we do get here?