Have never used the outdoor Clorox, but have used regular Clorox to wash the siding down on the house and garage each spring.Have been doing this every year for decades. Works like a charm to remove the dirt and mildew stains that try to grow on the shaded side of the buildings.
Will have to check this out. A sprayer would sure be nice.The way I do it always takes all day. Have always rinsed the siding down, then applied the diluted bleach-water with a long handled brush . Wait a few minutes, then rinse again with the hose. Presto, the siding looks like new again.