Sea foam can be a stubborn nuisance on outdoor fabrics, leaving behind unsightly stains and a salty residue. To effectively remove it, start by rinsing the fabric with fresh water to loosen the foam. Mix a solution of mild detergent and warm water, then gently scrub the affected area with a soft brush. Avoid harsh chemicals, as they may damage the fabric. For tougher stains, a mixture of white vinegar and water can help break down the residue. Rinse thoroughly and allow the fabric to air dry. Regular maintenance, such as rinsing after exposure to seawater, can prevent buildup and keep your outdoor fabrics looking pristine.