An outdoor building on our new property came with a few years’ worth of mold on the stucco:

We couldn’t run it on high, but the pressure washer didn’t really help at all. The green stains were stuck!
Enter one of my favorite solutions:

Bleach!
We didn’t spray the entire thing with the drug-store version pictured above, but you can see where I did a trial here:

For the rest of the mold on the building, we used a watered down solution of another outdoor bleach to spray the house, but Clorox makes an outdoor bleach that works on siding and patios too. You can find more information here at the Clorox website.
I love before and afters! Here is the before:


And here is an after shot:

I am so thankful for a way to clean outdoor stucco instead of replacing and repainting! We’ve used it on a roof, and painted siding too! Bleach works wonders, and is supposed to be safe for plants when used in recommended quantities. You can find a concentrated version of Clorox outdoor bleach here on Amazon.
This post was not sponsored in any fashion by any company, I just truly love these kinds of products! (The links to products are affiliate links, which help support our site at no extra cost to you.)