Dynamic and challenging weather conditions are the norm on barrier islands like Assateague, as seasonal weather patterns and occasional large storm events continuously reshape the landscape. Indeed, Assateague owes its very creation as a National Seashore to the weather. In the 1950's, some 5,000 private lots comprising what is now National Park Service land were zoned and sold for resort development.
After 3-12 months you would need to apply a wood cleaner to remove the gray wood cells. This can be done with scrubbing and or light pressure washing. After cleaning the deck you will need to neutralize the wood deck cleaner with a wood brightener. Let dry for 24-48 hours then apply your deck stain of choice.
Remove staining, mildew and old finish with a commercial deck cleaning solution. Pressure washing is almost always a must on older decks, but be sure not to use too much pressure. You can damage the wood if it's turned up too high. Usually 1500-2500 PSI is adequate for pressure treated lumber. Stay between 1200-1500 PSI for cedar and redwood.