After reading favorable reviews about Wet & Forget, I decided to try it on a large concrete patio with a chronic algae problem.
I didn't expect much, and I'm absolutely delighted with the results.
In the past, I've tried household bleach and swimming pool chlorine, both of which required laborious scrubbing with a stiff broom or brush, lots of rinsing, and ended up damaging the plants in the beds surrounding the patio.
I also tried oxygen bleach, which didn't damage the plants, but didn't work very well either.
I applied Wet & Forget with a tank sprayer, carefully following instructions, a day before rain was expected.
It didn't work immediately, but a couple of days after the rain when the patio was dry, the improvement was dramatic.
About a month later, I reapplied the product on a couple of spots that had a particularly bad algae buildup, and following another rain, these also cleared up.
I recommend Wet & Forget without hesitation!