For best results, it is essential to use the right cleaner. Bleaches and household cleaners are effective in removing dirt. Trisodium phosphate (TSP) is often used to remove grease and soot. TSP is an all-purpose cleaner and has been in use for years. It is generally mixed with a laundry detergent for cleaning jobs.
As handling problems are often associated with deck cleaners, it is better to wear rubber gloves and eye protection while using these cleaning products.
You can also take the help of a toilet brush for stirring the mixture so that the bleach powder dissolves completely in the water. Now put the mixture in a standard sprayer and spray the deck. Use it generously and allow it to remain for at least 15 minutes. This will help remove tough stains. Take a stiff brush and scrub the wood deck.
However, these machines generate extreme pressures that may remove the wood finish. This will decrease the durability of the wood, leaving it with a rough surface. Experts recommend a low power pressure washers (1500 psi or less) that have a wide fan tip. They do a nice job of cleaning decks without harming the wood finish.
So if you want to retain the appearance of your wood deck, cleaning is a must. Factors such as usage, weather, humidity, and UV exposure decide the need and the frequency of cleaning.