Decks are exposed to a wide variety of different materials and weather, and as a result can quickly become stained or discolored over time. Thankfully, no matter what the stains are caused by, they can most often be quickly and easily removed using household cleaning chemicals and equipment if you have the right know how.

Mold Stains

Mold can be removed from your deck by scrubbing either with a mixture of half white vinegar and half warm water for mild stains and small amounts of growth, or a mixture of half chlorine bleach and half warm water for large areas of thick growth and staining. Be sure to wear gloves when working with bleach, as it can burn your skin. Be sure to rinse away the bleach after you finish, as prolonged exposure can ruin the color of your deck.

Grease and Food Stains

Food stains from an outdoor barbeque or a party can quickly set into your deck and become unsightly. Grease can be easily removed with a simple mixture of common dish soap and warm water, but if the stain is still not coming out, powdered detergent provides a stronger cleaner. Use a sponge for light stains, and a stiff bristled brush for heavier ones.

Tree Sap

Tree sap is a common stain on most decks, but is especially prevalent in wood decks, when the sap can sometimes be already present on the deck boards when they are installed. Thankfully, tree sap is also fairly easy to remove. Use a putty knife to scrape away as much sap as possible, taking care not to cut into the deck, and then use nail polish remover to dissolve whatever sap is left. Be sure to rinse the area after you're done, as nail polish remover can bleach your deck.

Pet Stains

Even housebroken dogs can become confused in the difference between the deck and the outdoors. If your pet has an accident on the deck that leaves a stain, it can be easily removed with a mixture of two parts of vinegar and one part of warm water. The vinegar will act as a disinfectant and remove the stain, and will also discourage your pet from revisiting the area due to the smell. Repeat as needed until the stain is gone. If the stain won't disappear, try scrubbing baking soda on the area with the vinegar for a stronger cleaning solution.

For assistance cleaning your deck, consult a professional.