Deck cleaning sounds simple, but the wrong technique can cause real damage. Here is how to clean a deck safely whether it is wood or composite.

Start by Sweeping

Before you bring out water and chemicals, sweep the deck thoroughly. Pollen, leaves, dirt, and debris all need to come off first. A good push broom takes a few minutes and prevents you from grinding grit into the boards while you scrub.

Pay extra attention to corners, gaps between boards, and edges where debris collects.

Pick the Right Cleaner

Wood and composite call for different cleaners. Wood deck cleaners often contain oxalic acid or a brightener that handles tannin stains and graying. Composite cleaners are designed not to damage the cap stock.

Read the label and use the right product. A wood cleaner used on composite can dull the finish.

Skip the Bleach for Routine Cleaning

Bleach is sometimes used to handle mildew, but it can dry out wood fibers and weaken composite caps if used aggressively. For routine cleaning, soap and water or a deck-specific cleaner is usually plenty.

If you do need to use bleach for stubborn mildew, dilute it heavily, apply with a soft brush, and rinse thoroughly afterward.

Use the Right Brush

A soft to medium bristle brush on a long handle is the right tool for most deck cleaning. Wire brushes can damage both wood and composite. Save them for stubborn rust on metal hardware, not for the deck surface itself.

Scrub with the grain on wood. Direction matters less on composite.

Pressure Wash Carefully or Not at All

Pressure washing can do real damage if you are not careful. Keep the pressure under 1500 PSI on composite and under 1200 PSI on wood. Use a wide-angle tip. Stay at least 12 inches from the surface and keep the wand moving.

If you are not confident in pressure washing, a garden hose with a spray nozzle and a good brush will get most decks clean.

Tackle Specific Stains

Grease from grills, tannin stains from leaves, and rust from grill legs all call for specific approaches. Test any stain remover on a hidden area first. Manufacturers of composite usually publish a list of recommended cleaners for specific stains. Read it before experimenting.

A small stain handled correctly is better than a large one made worse by the wrong product.

Rinse Thoroughly

Whatever cleaner you use, rinse the entire deck completely afterward. Cleaner residue left on the surface attracts dirt and can cause uneven aging. A good final rinse with clean water is the last step.

Let the deck air dry before walking on it heavily or putting furniture back in place.

Set a Schedule

Twice a year is the right cadence for most decks. Spring and fall, with quick cleanups in between if pollen or storms call for it. A predictable schedule keeps the deck looking good and catches small issues before they become big ones.

Pro Tips From Our Crews

• Sweep first, always. Skipping this step grinds grit into the boards while you scrub.

• Use the right cleaner for your deck material. Wood and composite are not interchangeable.

• Avoid bleach for routine cleaning. Save it for stubborn mildew, well diluted.

• Test any new cleaner on a hidden area before applying to the full deck.

• Rinse thoroughly. Cleaner residue attracts dirt over time.

Twice a year is the right cleaning rhythm for most decks in our area. Spring before pollen season ends and fall after the leaves come down. Stick to this schedule and your deck will look great year-round without any major scrubbing project. Skip it and you spend a whole weekend trying to recover the look.

Common Questions From North Georgia Homeowners

Can I use a regular household cleaner on my deck?

Mild dish soap diluted in water works fine for routine cleaning of most decks. Avoid harsh chemicals like undiluted bleach, ammonia-based cleaners, or anything not specifically rated for outdoor surfaces. When in doubt, use a deck-specific product.

How do I remove grease stains from a grill?

Grease stains usually need a degreaser designed for outdoor surfaces. Apply, let sit briefly, scrub, and rinse. Composite manufacturers publish lists of recommended cleaners for specific stains. Check the list before experimenting on your boards.

Serving North Georgia

We design and build custom decks, screened porches, covered decks, pergolas, and outdoor living spaces across North Georgia. That includes Pickens, Cherokee, Gilmer, Fannin, Dawson, Forsyth, Bartow, Cobb, DeKalb, Fulton, Gwinnett, Hall, Lumpkin, Murray, Paulding, Union, and Gordon counties. If you are anywhere in our service area, we would love the chance to come walk your property and talk through what we can build for you.