Quote:
Originally Posted by B-flat
Yes, that works and I've done it with good results. Up north my concrete patio was very black on that concrete I used "Wet and Forget" it's about $35 for a small container, it doesn't work overnight but give it a few months and it will clean up the mess.
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Yes, I have used wet and forget but 30 second is faster and significantly cheaper. There is a video on YouTube comparing outdoor algae cleaners and 30 second is clear winner. However, leaving it on for 30 seconds doesn't make since, just my opinion. I also use it on my house once a year.