Spray the decking with a hose twice a year to remove general dirt build-up. Fill a bucket with warm, soapy water and use a bristle brush to scrub away tough dirty spots.
Apply a deck brightener to remove tannins, the brown pigment stains caused when wood in deck releases its tannins upon getting wet. Clean the deck with a broom and hose before applying the brightener. Follow the instructions provided with the brightener, which can be purchased at home improvement stores.
Remove snow with a plastic shovel. Apply rock salt to ice to melt it from the decking.
Wipe up food spills with a clean, wet cloth. If a stain appears, spray the area with a hose. Fill a bucket with warm, soapy water and scrub the stain with a bristle brush soaked in the water and soap.
Spray the decking with a hose to remove mold and mildew caused by debris. Fill a bucket with warm, soapy water and scrub the mold or mildew with a wet, soapy bristle brush until the stain disappears.