Hi. We've owned our home for three years. It is approx. 14 years old. There are three decks on it. It was fairly obvious that they had never been cleaned. We tackled that job this past weekend using Thompson's deck cleaner and elbow grease. What a job. The mildew was horrible. However, they look pretty good now on the top. The bottoms of the decks are still pretty grimy, but just near impossible to tackle.
Question: Do we now apply some time of water sealant, protector, or the like? Do we leave the decks alone now?