When there are black streaks, black stains, algae, moss or lichen on your roof, it not only makes your house look ugly, but it also shortens the life of the roof. Stain Medix Roof Cleaning is the best roof cleaning company in Potomac MD. We use state of the art equipment for roof cleaning services so that we can safely remove the algae, moss and lichen from your roof. Call us now for a free roof washing quote.