Exterior Decks When dealing with decks, one needs to be very careful since, although there are a variety of materials on the market, they all have to be cleaned a different way. Most wood decking is soft and gouge marks or "lines" will appear when cleaned improperly. Likewise, stain or sealant will greatly enhance these marks. SHORE CLEAN has over 25 years experience cleaning decks of all materials and knows the correct procedure to use so that you can continue to enjoy your deck year after year.