Cleaning Moss and Lichen Off Your Roof (Without Wrecking It) -- Plus a Plain-English Guide to Urethane

Original Air Date: 8/1/2026 Episode Number: 470 Episode Summary Three topics this week. Dan opens with a paint science segment answering a listener question about urethane and enamel -- two words that appear constantly on paint labels and mean different things than most people assume. Then a full two-segment deep dive on moss and lichen: first, how to safely remove them from different types of…