Left unchecked, nature's assault on a wooden deck will cause it to warp, gray and become a haven for mold growth. Moisture, pollen, and the sun can all wreak havoc on wood. You may have tried to perform maintenance by cleaning and applying a sealer, but with the same end result. Finish failure is a combination of factors. The key to success lies in starting with a thorough deck cleaning.
Most of the deck cleaners you find in home centers are merely inexpensive household bleach (look for the chemical sodium hypochlorite on the label) mixed with a little soap. Examples would be the Olympic pictured left. These products may remove mold or mildew but they do nothing to address removing a failed finish, removing gray or pH balancing a deck to prepare it for staining.
Step-1: Get Rid of the mold, gray, dirt and old finish
Restore-A-Deck's Step-1 cleaner takes the concept farther. The addition of five other cleaning agents and surfactants work to emulsify any stain that may remain on the deck. RAD's step-1 will also loosen gray fibers meaning with mild brushing or a pressure washer used at very low pressure you will be able to move quickly through the cleaning process. You get the cleaning power of much stronger chemicals without the risk to yourself, pets, children or your landscape.
The second part of the process is equally important. This step is what sets a professional preparation apart. The first stage of cleaning will leave the wood in improper pH balance. Prior to staining or sealing the wood should be slightly below neutral (acidic). Mold does not thrive in acidic environments, so this is further insurance against leaving any spores in the wood. Mold is the number one destroyer of deck finishes.