Thompson's is just a wax-based sealer that wears off fairly quickly. It should last for years. The best way to clean the deck is with a pressure washer which can be rented from many rental outfits. I also agree with cherbert that Thompson's is no good and the brand he reccommended is excellent. Diane, I guess one of the problems with this forum is that we don't always know where the poster lives.
Some products have regional appeal and distribution.
Up here in Wisconsin, I haven't found the product mentioned before. But, unfortunately, Thompson's is everywhere. Anyway, Consumers Report gave Olympic deck stain and sealer high marks for a moderately priced product, and I have used it without the once or twice a year application required of the paraffin products. If I had a better deck and more bucks, I'd probably use Sikkens. The deck in some spots is down to the wood again.