Getting mold off patio furniture and outdoor cushions

Match the cleaner to the material. Frames, plastic and resin get a white-vinegar solution — cut half and half with water — sprayed on, left to sit, and scrubbed with a soft brush. Fabric cushions and slings get an oxygen-bleach soak instead. Then everything dries in full sun, completely, before the patio goes back together.

Why chlorine bleach is the tempting wrong answer

The instinct is the jug of chlorine bleach, because it visibly wins in minutes. On fabric it loses twice afterward. First the color: unless the tag says solution-dyed acrylic — the expensive stuff, dyed through the fiber — the pattern on a box-store cushion is printed on the surface, and chlorine lifts it. Second the relapse: a cushion is thick, chlorine never rinses fully out of it, and whatever residue stays in the fiber is a meal laid out for the next bloom — in this climate, the moisture to sprout it arrives on its own every afternoon. Oxygen bleach rinses cleaner, spares the color, and keeps working through a long soak, which is exactly what fabric needs.

And if you do use chlorine anywhere on the patio, keep it in a separate session from the vinegar: combined they make toxic gas, and a screened patio is a poorly ventilated space.

Frames and plastics: the vinegar pass

This covers powder-coated aluminum, steel, PVC-strap chairs, resin wicker and molded plastic. White vinegar and water, half and half, in a pump or spray bottle; wet the surface, let it sit about ten minutes without drying out, scrub with a soft brush, rinse with the hose. On resin wicker let the liquid do the work down in the weave — the brush only reaches the surface. Wood, teak included, defects to the oxygen-bleach camp: that’s the standard cleaner for outdoor timber.

Before you call it done, tip every chair over. Mildew grows where rain rinses least and shade lasts longest, and on furniture that is the underside of everything: the backs of the arms, the lip under the seat, the weld points, the foot caps. The face you look at is the face that needs it least.

Cushions and slings: the oxygen-bleach soak

The tag comes first. If the cover zips off and the maker allows washing, pull it and wash it separately — cold, gentle, air dry — and the only thing left to treat is the foam, if it holds a smell. For everything else: dissolve oxygen bleach in warm water at the package’s dilution, in a bin or a well-scrubbed trash can. Sink the cushions — weigh them down, they float — and leave them thirty minutes to an hour. The soak is the labor-saver: the product works while you do nothing.

After the soak, scrub the seams and the piping — that stitching is where growth roots, not the open panel. Rinse with the hose until the water you press out runs clear. And press, never wring: twisting an outdoor cushion shifts the foam and leaves the cover shaped like a rag.

“A cushion is a sponge wearing a jacket. Wash the jacket all you like — the job isn’t done until the sponge inside is dry.”

The sun-dry is the step people skip

Cushions dry on edge: standing on their side, zipper corner down, so the foam drains through the seam instead of pooling against the deck. Flip them at midday. One full Miami day of sun finishes what the soak started — and dryness, not chemistry, is what decides whether the mold comes back. A cushion that goes back on the chair damp at six in the evening has already restarted the cycle you just broke.

Prevention: Florida’s summer writes the schedule

The summer pattern here is sun all morning, a downpour at three, and steam until dark. From June into October the cushions get wet almost daily and the drying window shrinks — that is the entire biology of the problem. The screen doesn’t save you: the cage stops leaves, not humidity, and its own washing calendar is covered in how often to clean a pool cage or lanai. If the green has already climbed the mesh around the patio, that wash is its own technique — it’s in the lanai-screens guide.

• Store cushions dry and upright. On edge, under real cover, never stacked flat while damp: a stack dries on top, and the faces touching each other never dry at all.
• The deck box shows no mercy. A closed deck box with one damp cushion inside is an incubator. Only bone-dry things go in — when in doubt, one more day of sun.
• After rain, tilt. Loungers at an angle, chairs on their side, cushions on edge against the wall: five minutes that take away the water’s whole night on the fabric.
• Before a trip, bring them in. If the house will sit empty during the wet season, the cushions sleep indoors — the whole-house version of that logic is in how to prevent mold and mildew in a Florida home.

Where the DIY ends

Washing patio furniture and cushions is not a service we publish — this guide is shared operating playbook, not a pitch. Our published outdoor add-on, “Patio or balcony cleaning,” covers one small outdoor area; the furniture itself is your Saturday’s work. What we do book is the other half of the same reset: while the cushions dry in the sun, the room behind the slider — floors, baseboards, the film a summer settles indoors — is what a deep clean is for: a 4–6 hour visit with a 2-person team, 42 items verified by photo, starting at $349. And the usual honest boundary: if what’s inside the house is active, spreading mold, that is remediation, not cleaning — our Terms reserve the right to refuse or stop service where conditions like mold are unsafe for the team.

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