Options for effective organic moss removal include using vinegar, baking soda or Dawn Ultra dish detergent. These products do not cause problems in streams due to runoff water and do not stain surfaces like those containing iron, copper or zinc.
Vinegar is an effective treatment for moss growing on roofs and the north side of buildings. Most of the time, spraying with household vinegar on a warm day with some cloud cover and allowing the solution to stand for 10 minutes is enough to kill the moss. Scrubbing the area with a stiff brush or using a scraper for smooth surfaces generally removes the remaining growth. For stubborn moss, a stronger 20 percent acetic acid solution is sometimes more effective. Vinegar kills other plants, so users should avoid spraying sensitive landscaping.
A solution of half a cup of dishwashing detergent in a gallon of water is also effective for killing moss. It does not harm other plants, so users can put the solution in a garden sprayer and use it for killing moss that grows in the lawn.
Baking soda is effective at eliminating moss from flat surfaces such as decks. The user sprinkles the soda on the surface and spreads it with a broom. In a few days, the moss should die.