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Sodium Bicarbonate makes moss’s environment a Base (Above pH 7) Since moss grows in a pH environment of 5.0 – 5.5 or 6.0, by changing the environment to a base level it will effectively kill the moss. Below is a list of some common household items that are bases. By mixing these products with water or by applying them directly they can kill moss in yards, off of roofs, siding, decks, or other unwanted areas. Baking Soda Baking Powder Salt Ammonia Soap Bleach (Do not mix bleach and ammonia) {Sold everywhere – Costco has 13lb bags!}