Pressure washing your wooden park benches can breathe new life into them, but doing it safely is crucial to avoid damaging the wood. Here’s your friendly, step-by-step guide to getting it right.
First, gather your gear. You'll need a pressure washer with an adjustable PSI (pounds per square inch) setting. For softwoods like pine, stick to 500-600 PSI. For hardwoods like oak, you can go up to 1200 PSI. Always use a wide 40-degree fan tip nozzle, as it disperses the pressure and is much gentler than a concentrated stream. You'll also need a dedicated wood cleaner or a mild detergent, a stiff-bristle brush (not metal), a garden hose, and safety goggles.
Preparation is key! Clear the area around the bench. Pre-rinse the bench with a garden hose to remove loose dirt and debris. This prevents you from grinding grit into the wood during washing. Apply your chosen wood cleaner according to the product instructions and let it sit for the recommended time to break down grime and mildew.
Now, for the main event. Keep the pressure washer nozzle at least 12-18 inches away from the wood surface. Start with the highest distance and test a small, inconspicuous area. Move the wand in smooth, long strokes, following the wood grain. Never hold the stream in one spot, as this can gouge and splinter the wood. The goal is to rinse off the cleaner and dirt, not to strip the wood itself.
After washing, rinse the bench thoroughly to remove all cleaner residue. Then, let it dry completely in the sun for at least 48 hours. This is the most important step for safety and the longevity of your bench. Once bone-dry, apply a water-repellent sealant, wood stain, or outdoor-rated oil to protect the wood from future moisture and UV damage. Reapply this protective finish every year or two.
By following these simple steps—using the right pressure, keeping your distance, moving steadily, and sealing the wood afterward—you can safely restore your wooden benches to a like-new condition and enjoy them for many more seasons to come.