How to Properly Maintain Your Composite Deck

Composite decking is low-maintenance, not no-maintenance. Learn the essential cleaning routines to protect your Trex investment.

Composite decking companies famously advertise their products as "zero maintenance." While it is true that you will never have to sand, plane, or restain a Trex board, referring to them as completely maintenance-free is slightly misleading. They require routine cleaning to prevent environmental buildup from degrading the surface.

The Threat of Pollen and Tannins

In Virginia, the aggressive spring pollen drop blankets decks in a sticky yellow film. If left unwashed, this organic matter mixes with rainwater and decaying autumn leaves to form tannin stains—dark, muddy spots that embed themselves into the artificial grain of the composite board.

The Safe Cleaning Routine

To preserve your manufacturer warranty, you must employ non-destructive cleaning methods.

1. **Routine Sweeping:** Keep the deck absolutely clear of wet pine needles and leaves. Decomposing leaves produce acid that can permanently stain the plastic capping. 2. **Soap and Water:** Twice a year (usually early spring and late fall), scrub the deck thoroughly using a soft-bristled brush, warm water, and a mild dish soap like Dawn. 3. **Avoid the High-Pressure Blaster:** Never use a pressure washer equipped with a zero-degree narrow tip. Aggressive pressure (exceeding 1500 PSI) can physically score and scratch the polymer capping, permanently ruining the aesthetic texture of the board.

If your composite deck has been neglected for years and is covered in stubborn mildew, Loudoun Decks offers professional Soft Washing services utilizing specialized, composite-safe chemical agents that melt organic stains away without the use of damaging high-pressure wands.