Dirt-repellent coatings: what they do and what they don't

For anyone considering having glass, a facade or solar panels treated after cleaning. A dirt-repellent coating makes dirt stick less and lets rain carry more of it away, which can lengthen the time until the next clean. It does not make a surface self-cleaning, even if some products suggest otherwise. These articles explain how nano and lotus-effect coatings work, how long they last according to their manufacturers, and what to check before a coating goes on solar panels, including its effect on the warranty.