I have a 25 year old pressure treated deck. It has been treated sometime in the past, but not in a long time and I'm not sure with what. I've already cleaned it with bleach and a pressure washer. Some of the old stain or sealer remains. I live in Alabama. Assuming I want to go forward with TWP, how do you suggest I proceed now and which TWP would be best?
Since you have some old stain remaining you should use the Restore A Deck Stripper and pressure washing to remove. Use the brightener after you strip off the old stain.