Mold on cedar soffit - how to fix?
Spray the area with some vinegar and let it sit or 30 to 60 minutes, then wipe off with a cloth or sponge. Vinegar is better than bleach for killing mold because it soaks in below the surface to kill the mold roots. Bleach only takes care of the surface mold. I have used it on my stained deck and it has always worked great and didn't affect the wood color.