The condition of your deck will determine the type of cleaning products you need.
Use a deck stain stripper on all exterior wood that has been previously treated or stained.
Always follow up with a brightener. Brighteners neutralize strippers and restore the natural appearance of wood. Brighteners also take the factory finish off of new wood.
Deck cleaner removes mold and mildew and helps prepare the wood surface for the next stain or coating application.