The deck stripper you choose depends on what is currently on your deck. If you have a solid or semi-transparent stain we would recommend a stain stripper that will remove dirt, any existing wood stain finish and graying.
If the deck is painted or you are unsure of what is exactly on the deck, you should try a stain stripper that will remove any finish including Latex paint.
Which ever deck stripper you choose, be sure to work earlier in the day so the sun will not evaporate the deck stripper off the deck. Apply with a roller or spray applicator, and allow the product do its job. Then rinse off the stripper with a pressure washer.
Keep the pressure not too heavy, and keep the pressure washer at least 18inches off the deck surface to avoid damaging the wood. You can use a stiff bristle brush to get any stubborn spots. Allow the deck to completely dry before applying your new finish.
Autumn is actually the best time to use a deck stripper and refinish wood due to the low humidity. Enjoy that new deck!