How to Clean a Roof Safely

The Soft Wash Method for Algae, Moss & Lichen

Black streaks on a roof are algae, not dirt, and the moss in shaded sections is actively shortening the roof's life by holding water against shingle edges. Both come off easily with low-pressure soft washing, and both get far worse if you attack them with a pressure washer, which removes the ceramic granules that shield the asphalt from UV. This guide covers the gear, the solution, dwell times, working safely at height, protecting the planting below and how zinc strips stop regrowth.