Polywood is a great outdoor product due to its longevity.
When cleaning, use a very mild soapy solution to wipe down the wooden surface. Surface characteristics of the product may require the use of a soft bristle brush to get into the creases. For fine surface scratches use a very fine emery board and sand with the grain gently.
*Note: Always use caution when opening boxes and removing the protective materials. Avoid using anything sharp as to not damage the products.