Fall brings shorter days, damp mornings, and a carpet of wet leaves, and somewhere along the way your porch swing picks up a green, gray, or blackish film. It looks worse than it is, but it deserves attention: that film holds moisture against the surface, and on wood, moisture that sits for months is how a cosmetic problem turns into a real one. The good news is that cleaning it takes an afternoon and a few basic supplies.
What You're Actually Looking At
A slick green or green-brown coating is usually algae. Fuzzy gray, black, or dark-speckled patches are typically mildew or mold, which feed on pollen, dust, and bits of leaf that settle on the surface. Both love shade, still air, and moisture, so the underside of the seat, the gaps between slats, and the shadiest corner of the porch are the first places they show up.
One quick check before you scrub: press a screwdriver tip into a dark spot on a wooden swing. If the surface stays firm, you're dealing with surface growth and cleaning will fix it. If the tip sinks in or the wood feels soft and crumbly, that's rot, and that part needs repair or replacement rather than cleaning.
Gather Your Supplies
- A soft-bristle brush (not wire, which scars both wood and plastic)
- A bucket and a garden hose
- Mild dish soap
- Oxygen bleach (sodium percarbonate) for wood, used according to the product label
- Rubber gloves and eye protection
- Old towels or rags
Take the cushions off first and clean them separately; our fall cushion care guide covers that. Then test whichever cleaner you choose on a hidden spot, such as the underside of an arm, and let it dry before committing to the whole swing.
One safety note: never mix cleaning products. Chlorine bleach combined with ammonia or vinegar creates toxic fumes. Use one product at a time and rinse thoroughly in between.
Cleaning a Poly Lumber Swing
Recycled poly lumber is non-porous, so growth sits on the surface and mostly wipes away. Mix dish soap into a bucket of warm water, scrub the frame with the soft brush, and rinse with the hose. For stubborn spots, let the soapy water sit for a few minutes to loosen the film before scrubbing again. Skip abrasive pads, which can leave scuffs, and check your manufacturer's care instructions before reaching for anything stronger. If you're tempted to bring out the pressure washer, read how to pressure wash a porch swing without damaging it first.
Cleaning a Wood Swing
Wet the wood with the hose, then apply an oxygen bleach solution mixed according to the label. Oxygen bleach is gentler on wood than chlorine bleach, which can lighten the color, roughen the grain, and damage whatever finish you have left. Let the solution work for the time the label recommends, scrub with the grain, and rinse thoroughly. Then let the swing dry completely, which can take a day or two in cool fall weather, before you do anything else to it.
Once it's dry, take a look at the finish. If the wood looks thirsty or the paint is flaking, now is the time to refresh it. Our step-by-step stain and seal guide walks through the process.
Don't Skip the Chains, Hooks, and Underside
Algae and mildew collect wherever water lingers: under the seat, along the back slats, and around the points where the chains meet the frame. Wipe down the chains and hooks with a soapy rag, and look closely at the hardware while you're there. If you spot orange rust, our guide to removing rust from porch swing chains and hooks will help.
Keeping It From Coming Back
- Sweep away debris. Leaves and dirt on the seat and the floor beneath it hold moisture and feed growth.
- Give the swing airflow. Keeping it a few inches off a wall or thick shrubs helps it dry faster after rain.
- Wipe it down regularly. A quick pass with a soft brush every few weeks through the damp season takes minutes and prevents buildup.
- Use a breathable cover. If you cover the swing for winter, avoid a plastic tarp, which traps condensation. Our winter storage guide compares covering, storing, and leaving it out.
When Cleaning Isn't Enough
If a swing has soft spots, loose joints, or damage that keeps coming back, it may be time to replace it. Browse cedar porch swings if you love the look of real wood, poly and recycled plastic porch swings if you'd like something that's easier to keep clean, or the full range of porch swings to compare sizes and styles.
