Deck and Fence Cleaner

Material A
Sodium Hypochlorite, otherwise known as bleach.

Disposal: Bleach cannot be put in any household bins, nor should it be put down any drains or sewers. Any bleach you have to dispose of should be taken to a drop-off depot for proper disposal.

Material B
Sodium Percarbonate. This is considered to be an eco-friendly, water-soluble chemical that is more commonly used instead of bleach to clean products in general.

Disposal: Although considered to be environmentally friendly, it is still a better option to dispose of this at a drop-off depot, where professionals can ensure that it is disposed of correctly.

Best Alternative
Between the two most common options, deck cleaner made of sodium percarbonate is a smarter and environmentally-friendly option should you choose to use a deck cleaner. If your deck, fence or patio is not severely stained, one should always attempt to use water instead.