Algae vs Mildew on Vinyl Siding: Spot, Clean, Prevent
Algae on vinyl siding is usually a green, slick, photosynthetic surface growth, while mildew is a loose field term for powdery or spotty fungal growth supported by moisture and dirt. Color alone cannot identify either organism. Pattern, texture, moisture conditions, a careful test patch, and the stain’s response to cleaning provide a more reliable diagnosis. […]