My redwood deck has remained unfinished for several years. How should I prepare the deck and bring back its color before refinishing?

For years the CRA has recommended the tried-and-true method of a preliminary scrub with TSP and household bleach to clean the deck and remove mildew. To remove stains and restore the natural color, oxalic acid is then applied. Recently, however, many excellent commercially formulated deck cleaners and restorers have become available. These are based upon non-chlorine bleaches, detergents and/or oxalic acid. The manufacturers of these commercial products supply comprehensive directions.