The best homemade deck cleaner is one cup of powdered oxygen bleach dissolved in two gallons of warm water with a squirt of liquid dish soap.
Apply it with a garden sprayer or bucket, let it sit 15 minutes, work it in with a deck brush, and rinse with a garden hose. It lifts green algae, mildew, and general grime off wood decks without harming nearby plants.
That recipe alone handles 90% of dirty decks. The other six below exist for the stubborn stains, the composite decking, and the days you’d rather raid the pantry than drive to the store.
The 7 Recipes at a Glance
| # | Cleaner | Mix | Best For |
| 1 | Oxygen bleach wash | 1 cup powder + 2 gal warm water + dish soap | Algae, mildew, gray wood |
| 2 | Simple soap wash | ¼ cup dish soap + 1 gal warm water | Routine dirt, pollen |
| 3 | Baking soda scrub | ½ cup baking soda + 1 gal warm water | Light stains, odors |
| 4 | Vinegar solution | 1 cup white vinegar + 1 gal water | Mildew spots, spilled food |
| 5 | Borax mix | ½ cup powdered borax + 1 gal warm water | Moss and green growth |
| 6 | Oxygen bleach paste | Powder + just enough water to form paste | Stubborn stains, grill grease |
| 7 | Tea tree soap wash | 1 gal warm water + dish soap + 10 drops tea tree oil | Mildew-prone shady decks |
Before You Mix Anything
Sweep off the loose debris first. Leaves, pollen clumps, whatever the wet dogs and muddy shoes dragged up there. A cleaning solution can’t reach the deck boards if it’s fighting through a layer of loose dirt.
Two safety notes, and they matter:
- Never combine chlorine bleach with ammonia based ingredients or vinegar. The reaction releases toxic chloramine gas, and the health risks are serious enough that state health departments publish warnings about it.
- Wear rubber gloves and goggles with any recipe stronger than plain soap. Oxygen bleach is gentle on the planet and still capable of skin irritation.
Skip liquid chlorine bleach on wood entirely. It breaks down the fibers, bleaches the color unevenly, and cooks nearby plants. Oxygen bleach, a hydrogen peroxide derivative, cleans just as hard without the collateral damage, which is why the EPA highlights peroxide-based ingredients in its safer cleaning product criteria.
How to Apply Your Homemade Deck Cleaner
Recipe 1 is the workhorse, so let’s walk through it. Dissolve the powdered oxygen bleach (OxiClean powder works fine) in warm water, add the liquid dish soap, and stir until you get a light lather. Pour or spray it across a manageable section.
Now wait. Fifteen minutes of soaking does more than an hour of scrubbing, because the oxygen bleach needs time to break down what’s living on your deck.
Then comes the elbow grease. Scrub with the grain using a stiff deck brush, hit the deck railings while you’re at it, and rinse everything with a spray nozzle before the solution dries. If you’re tempted to grab the pressure washer instead, keep it under 1,500 PSI and hold the wand moving, a power washer parked in one spot will chew a groove into pressure treated decks faster than you’d believe.
The other recipes follow the same rhythm. Apply the cleaning solution, let it sit, lightly scrub, rinse. The baking soda scrub and the oxygen bleach paste are the exceptions, those go directly on tough stains and get worked in with a scrub brush before rinsing.
A few extra pointers worth keeping:
- Mix a fresh batch every time. Oxygen bleach loses its punch within a few hours of hitting water.
- Test on a hidden corner first, especially on composite decking, which prefers the gentler soap and vinegar recipes.
- Rinse your brush’s bristles between sections so you’re spreading suds, not yesterday’s grime.
- Reseal wood afterward. A clean deck drinks up a penetrating sealer beautifully, and if you’re unsure which product to use, our roundup of the best deck sealers of 2026 compares the top options.
The tea tree recipe deserves a special mention for shaded decks that stay damp. The oil slows mildew regrowth and leaves a fresh scent that beats the chemical smell of store-bought deck cleaners. And if scrubbing by hand sounds miserable and you’d rather buy something ready-made, we tested the commercial options in our guide to deck cleaners that actually remove mold.
FAQ
How often should I clean my deck?
Twice a year keeps most decks happy, once in spring and once in fall. Homes surrounded by trees or sitting in heavy shade might need a third round when the green algae shows up mid-summer.
Will these recipes hurt my composite deck?
Recipes 2, 3, and 4 are safe for composite. Skip the borax and go easy with any paste, since aggressive scrubbing can scratch the cap layer. Curious how composite compares to wood for maintenance overall? Our breakdown of PVC and composite decking covers it.
My deck is clean but still looks rough. Now what?
Cleaning removes dirt, not damage. Splinters, cupped boards, wobbly deck railings, and soft spots are structural problems, and a warm sudsy solution won’t fix a single one of them.
Or Skip the Bucket Entirely
Some Saturday mornings are for scrubbing a refreshed deck into existence. Others are for realizing the deck under all the dirt has simply reached the end of its road. If yours is more gray than grain at this point, cleaning is a bandage, and our deck building team can tell you honestly whether a restoration or a rebuild makes better financial sense. Call us at (910) 985-5199 or message us here and we’ll take a look, no scrub brush required on your end.