Add wood stain & finish stripper to a garden sprayer and apply generously over the whole deck. After waiting instructed time, use a power washer (around 1500 PSI) to remove the stain. Go in a slow, smooth sweeping pattern.
Apply Wood Brightener
Wash out your garden sprayer, and refill with the brightener. Apply generously and wait the instructed time. Then, rinse off with a regular garden hose, or with your power washer turned off
Sand & Stain
After your wood is nice and bright to it's original state, start preparation for the new stain. You'll need to drive down any popped nails or loose screws (PS screws always make decks last significantly longer) and make sure the boards are all straight & even. Then sand the whole deck using 60 to 80-grit standpaper. Then blow off the deck, apply your stain with a brush (better than a roller, because you get to work the stain into the pores) and violia! Wait a day if adding more than one stain coat.