For best performance, keep the surface of Arris Trim clean and free of debris. For removing dirt or debris, power wash or hose off the surface of the Arris Trim. Use a fan tip nozzle and test the setting of the power washer to ensure it will not damage the surface of the board. If the board does not come clean, a mild household cleaner can be used in conjunction with a medium nylon bristle brush. Rinse with a hose or power washer, once again making sure the settings of the power washer do not lead to damage of the surface of the Arris Trim. While Arris Trim is stain-resistant, it is not stain-proof. Care must be taken to remove all stains with water and a mild household cleaner within forty-eight (48) hours of exposure. Mold and mildew can settle and grow on any outdoor surface and, if not properly cleaned, can stain that surface. For best results, periodically clean the surface of the Arris Trim, keeping it free from dirt and debris. When using cleaners other than a mixture of mild detergent and water, it is best to test on a small area, or a scrap piece of Arris Trim, to make sure it does not harm the surface or damage the product’s appearance. Always read the cleaning product manufacturer’s specific information before using any product on your Arris Trim and follow their instructions