Worked well on my stone veneer. Sprayed on and left for 15 minutes before rinsing. See before and after pic. Prepped area very well by watering nearby in-ground plants, covering them with plastic, catching most of the water from rinsing in a plastic tub and disposing of the water in a sink. Happy with results.
Clotox Outdoor bleach is the best i have used to get rid of green algae and the really tough black algae that griws on expised concrete in Florida. I ysed a roller at first and it killed the green algae easily but i had to use a stiff brudh on a broom to scrub the bleech into the black crud. It even took a second application an s few spots since it had been there for a couple if years. It did a great job!! I am very satisifed with the tesults. I tried others and this worked the best. Give it a shot. Its not expensive. See picture of before and after
My go to product for several cleaning jobs outside the home. I use this product for cleaning the driveway and sidewalks around my property. As well as cleaning the vinyl siding and the roof.....I have several trees around my home and clean up which is an ongoing job. I need a product that lasts as well as works and this fits the bill for me. It comes concentrated so it can be diluted to the strength you need depending on the job at hand. I also use the product in my drains in the home as well as my AC drain.