Help me identify what this black stuff is on exterior wall? - Cleaning Talk - Professional Cleaning and Restoration Forum
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post #1 of Old 05-31-2018, 10:52 AM Thread Starter
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Join Date: May 2018
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Help me identify what this black stuff is on exterior wall?

Hello all, my first post here. Not sure if it's the right place to ask, but I'll give it a shot. What is that black stuff all over my wall? On the picture, I have pressure washed it with a sun Joe spx3001, it seems to clean alright, but it leaves a reddish tint on the spots where it was black. What are these stuff and how can I clean it off and prevent it? I'm looking to do this myself, Any help appreciated. Thanks.
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