Does your pool deck have unsightly stains you'd like to remove?
If so, the best way to clean those stains from your concrete or paver decks is to try pressure washing first, and then scrub with a firm brush and dish soap if needed.
If your deck is made of brick pavers and the stains persist, check with a paver supply company that offers a cleaning solution that is safe to use on brick pavers.
Do not use any type of acid that is used for clay bricks (such as muriatic acid) unless you are certain it will not damage your bricks-and even then, you'll want to keep it away from your pool!
If all else fails, you can simply replace the few stained pavers with new ones.