 The secret with that particular product, and, you know, I mean, if you've got up there with soap and bleach, you could probably scrub it off, and there's other products you can use. But like a bleach, it's not a total kill. Now, it'll get rid of the green. It'll look clean. But the regrowth will be, it'll be back next summer. The wet and forget is a 100% total kill. If you spray it all, it will all die.