Safe and eco friendly alternative to caustic cleaners. Multi-use product - can be used to clean a variety of surfaces. Safe to use on docks and bridges. Easy to use product. TW Deck Safe - 100% Sodium Percarbonate is the environmentally friendly choice for all wood surfaces. Unlike harsh alkaline cleaners, Sodium Percarbonate, also known as oxygenated bleach or solid hydrogen peroxide, does not work by increasing the pH of the solution it’s in. Instead, when dissolved in water, sodium percarbonate releases hydrogen peroxide and carbonate ions. Hydrogen peroxide is effective for breaking down stains, dirt, and organic compounds through oxidation. Sodium percarbonate is considered more environmentally friendly compared to chlorine-based bleaches because it breaks down into water, oxygen, and carbonate without leaving harmful residues. TW Deck Safe will remove light organic growth, dirt and weathering. We highly recommend using TW Deck Bright to brighten and neutralize the surface after cleaning.