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Inhibits Growth of Odor Causing Bacteria, Mold and Mildew BacShield is a product of modified carbohydrates found in crab shells, a plentiful renewable resource. BacShield incorporates the environmentally derived antimicrobial properties of thesecrab shells into a treatment for textiles and surfaces. This product is perfect for harsh environments and outdoor surfaces like fences, sidewalks, roofs, vinyl siding, patios, decks, and otherhorizontal or veritical surfaces.