Should I Pressure Wash My Deck Before Staining?

A freshly stained deck looks fantastic and protects your outdoor living space from moisture, sun, and wear. But stain only performs well when the surface is thoroughly cleaned first. In Southern Oregon – where damp winters invite moss and algae and hot summers dry out wood – good preparation is essential.

Why Deck Preparation Matters

Before any stain or sealer can protect your deck, the surface must be clean and open-grained. Dirt, mildew, and weathered fibers act like a barrier, preventing the stain from soaking in evenly. That leads to premature fading, peeling, or uneven color—especially under Southern Oregon’s intense summer sun.

• A clean surface allows stains to bond and last longer.

• Removing organic growth like moss and algae prevents it from trapping moisture beneath the finish.

• Proper prep extends the life of both the stain and the wood itself.

Should You Pressure Wash Before Staining?

The most common answer is yes, you should pressure wash a deck before staining. Pressure washing (at the correct setting) or professional soft washing removes deep-set grime and opens the wood grain for maximum stain penetration. Simply sweeping or scrubbing rarely reaches all the embedded dirt and mildew.

• Pressure washing lifts stubborn mold, algae, and old stain residue.

• Soft washing with the right cleaning solution kills spores, so growth doesn’t return quickly.

• Industry guidelines from stain manufacturers stress thorough cleaning as the first step to a lasting finish.

How to Pressure Wash Safely

Deck wood can be damaged if too much pressure is used, so technique matters. Take your time and keep the spray moving to avoid carving lines into the boards.

• Use a fan tip and hold the nozzle 12–18 inches from the surface.

• Work with the grain of the wood, not across it.

• Keep pressure low: about 500–800 psi for cedar and redwood; slightly higher for harder woods.

• Allow drying time: at least 24–48 hours of dry weather after washing before you apply stain.

Pro Tip: Pacific Home Painting uses commercial equipment and carefully controlled pressure to clean decks without splintering or fuzzing the wood.

Pressure Washing Moss, Algae, and Sun Damage

Southern Oregon’s climate brings unique challenges. Shade and moisture allow moss and algae to flourish, while strong summer sun dries and grays the boards. In fact, these are some of the main reasons you should pressure wash your deck before staining.

Moss and Algae

Pressure washing combined with a mild deck cleaner kills spores and prevents quick regrowth.

UV Sun Damage

Sunlight raises the grain and leaves wood looking dull. Washing removes loose fibers so the stain adheres to a smoother surface.

Taking the time to eliminate these issues helps your stain stay beautiful and protective.

When to Call a Professional

If your deck is large, multi-level, or badly weathered, a professional cleaning service can save time and ensure consistent results. Pros have the right detergents and the skill to adjust water pressure for different wood types.

• Experts know how to balance pressure and cleaning solutions for each surface.

• A professional team can combine cleaning and staining in one visit, saving you multiple weekends of work.

• Hiring a pro often prevents costly mistakes like etched boards or uneven staining.

Ready to Protect Your Deck?

A quality stain job starts with a spotless surface. Pacific Home Painting offers expert deck cleaning and staining services throughout Medford, Grants Pass, Ashland, and the entire Rogue Valley. We use professional equipment, safe techniques, and premium products to give your deck a beautiful, long-lasting finish. Contact us today for a free estimate and enjoy a deck that looks great season after season.