Karmic Report post Posted September 24, 2020 Hello, Any ideas in what to add to mixture to remove lichen spots? I typically mix 5-6% SH w/ surfactant, lichen still on roof after few months. Share this post Link to post Share on other sites
Apple Roof Cleaning (813) 655-8777 Report post Posted November 23, 2020 Try adding some sodium hydroxide, maybe a few gallons to every 30 gallons of mix Share this post Link to post Share on other sites