 Because it's not a huge project, I'd recommend you do that. So you spray it on, you wait five, six, seven weeks, somewhere in there, and it will just be gone. It won't be unsightly anymore. It'll look clean. It'll be clean. It will have killed the algae and killed the fungus. And then in a year, next spring or summer, re-spray it. And you'll be a year ahead of it. It'll always look clean.