Decking and Outdoor Living

Spring is the start of the outdoor living season when homeowners begin to get their deck or patio ready for outdoor entertaining. Here are some general tips for cleaning your composite deck along with types of cleaning agents best suited for washing composite decking materials.

Wash and rinse your deck
Start cleaning your composite decking by washing with soapy water. Start at the top of the deck railing and work your way down to the composite deck surface. It's necessary to remove the dirt and chalking that accumulates on the composite deck surface. This will also prevent the build-up of pollen and debris that can cause mold and mildew growth. Pressure washers should only be used at lower pressures to wet and rinse synthetic decking and railing. Pressure washers should not be used to “blast-off” soiling agents; attempting to do so can drive the dirt deeper into the decking material. Test on an inconspicuous area before washing the entire deck.

Basic deck cleaning agents
Deck wash / cleaners usually contain sodium percarbonate and a detergent, which is effective on normal dirt and grime and bleaches out mold and mildew stains. Oxalic acid cleaners are effective on rust stains from metal patio furniture. Commercial degreasers contain propylene glycol, sodium hydroxide, and various detergents for removing grease and oil stains.

When cleaning composite decking, spot removers can be used sparingly on those stubborn grease or oil stains but should be washed off quickly with water, as it will attack the grain pattern. They normally include petroleum distillates, xylene, methanol, acetone, or other organic solvents.