Wash it in late spring — April into May — right after pollen season has finished dropping its load and before the daily summer rains start feeding algae. Then plan a second, lighter pass in October or November as the wet season closes. A mid-summer wash is the one that gets undone in weeks.
The reason for those dates isn’t weather in the abstract. It’s that Florida dirties a screen in two stages, and they arrive in order.
That’s the South Florida version of it. If you’d rather not run this schedule yourself through a Miami summer, tell us about the place and we’ll send a price for keeping it on one.
The food arrives first, the water second
From late winter into roughly April, South Florida coats itself in pollen — oak, pine, palm. You see it as the yellow-green film on the car and on the pool surface, but where it lodges is in the mesh, which is a surface engineered to catch things out of the air. That dust isn’t algae yet. It is organic material settling into the weave and along the spline, waiting.
The missing ingredient shows up in May. South Florida’s wet season runs roughly May through October: rain most afternoons, warm nights, and mesh that never fully dries between one storm and the next. That is when winter’s pollen becomes summer’s green. Algae and green mold don’t need soil — they need moisture, warmth, and something organic to start on. The dry season delivers the third ingredient; the wet season delivers the first two.
“Wash between the two stages — you take away the food before the water arrives.”
Why April and May buy more than any other month
A late-spring wash goes into the five wettest months of the year clean, which is exactly where a wash buys the most months of clear mesh. The same job done in January looks beautiful all dry season — and by June it no longer matters, because summer starts from zero anyway. You pay for a wash once; the question is how many rainy months get the benefit of it.
There’s a trade reason too, not just a calendar one. Soft washing depends on dwell time: the solution has to stay wet on the panel for three to five minutes without drying. On an April morning, shaded and with no three-o’clock storm on the way, that is achievable panel by panel. In August you are racing a cloud building over the house, and a solution rinsed off halfway through simply did not do its job.
The third benefit is maintenance. The pre-season visit is the moment when somebody is already up at the panels and can see spline lifted out of its channel, a loose frame screw, or mesh that tears under thumb pressure — things worth knowing before June 1 rather than in September.
Why the July wash doesn’t hold
It is the most common complaint about cages: “we washed it a month ago and it’s green again.” Almost always that was a mid-summer wash. In July and August the mesh is wet again the same afternoon, the nights never drop far enough to dry it, and growth restarts on a surface that has just been made ideal to start on. The wash wasn’t done badly. It was scheduled badly.
That said, the calendar is for planning, not for enduring. If the cage is green in August, wash it in August: established growth takes longer dwell times and more labor the longer it sits — one of the levers we take apart in what pool cage and lanai cleaning costs in Miami, where the $200–$600 range that trade publishes gets pulled apart piece by piece. Waiting is rarely the cheap option.
The second window: October into November
When the rains ease off, the mesh is carrying five months of growth. Left alone, the dry season bakes it on: sun and salt wind turn a soft film into a hard, bonded layer that later needs far more solution and far more brushing. An October or November pass lifts it while it still comes off easily, and leaves the cage presentable for exactly the months you actually use the patio — and for the arrival of anyone who winters here.
That second pass is rarely a second professional wash. In most homes it is a hose, a pump sprayer, and green patches handled one at a time over an afternoon. The full wash keeps its own clock — every 12 to 18 months, tightening to 9 to 12 near salt water — which is the ground covered in how often to clean a pool cage or lanai in Florida. The two fit together: the calendar tells you which month, the frequency tells you which year.
The season changes the date, never the method
April or October, screens get soft washed: a mild solution, dwell time, a soft brush braced from the far side. Never a pressure washer. Concentrated force is the most common way mesh gets torn in Florida, and in October the risk is higher still, because five months of sun leave the material more brittle than it was in spring. The full panel-by-panel technique is in how to clean mold and algae off lanai screens.
What JAS books on those dates — and what we don’t
Washing the whole cage — the mesh and the structure from the outside — is a soft-wash contractor’s trade, and it is not a service JAS sells. So nothing in this article is our upsell: we are handing you the best date for a job you will hire someone else to do. Fixed cage panels are in none of our published add-ons either — the outdoor ones are “Patio or balcony cleaning” and “Sliding-door track cleaning”, and the windows add-on is priced per reachable interior pane.
What we do book is the other half of the same space, and it fits neatly into the same week: the room behind the slider and what is reachable at floor level. Our deep clean is published at “Starting at $349” — a “4–6 hour visit · 2-person team”, “42 items verified by photo” — and it covers exactly what a lanai room collects on the inside: baseboards, door frames and edges, sills, reachable vents, and the slider glass that connects the house to the patio. If the contractor comes Tuesday, that visit on Wednesday closes both halves in one week.
The buying order is the one our Terms publish: “We price before you commit: you request a quote, see it, and then request a time”. On eligible completed visits, your CleanCheck report follows with checklist status and photos. And one boundary the season never moves: if what is growing inside the enclosed room is active mold, a cleaning visit is not remediation and we do not describe it as one — our Terms reserve the right to refuse or stop service where conditions are unsafe for our team, such as mold, infestation, or biohazards.
FAQ
My cage is already green and it’s July. Do I wait for spring?
No. Established growth gets harder and more expensive to remove the longer it sits, so wash it now and start the calendar over next April. The seasonal windows are for planning a wash, never for postponing one the screens already need.
Two washes a year sounds like double the money. Is that what you mean?
Not usually. The full professional soft wash is the every-12-to-18-months job in the trade’s own published care guides; the second seasonal pass is normally a hose rinse and spot-treating you do yourself in an afternoon. One paid wash, timed well, plus one free pass at the end of the rains.
Does hurricane season change the timing?
It reinforces it. Atlantic hurricane season runs June 1 through November 30, so a late-spring wash lands just before it opens — which is also the natural moment to look at the spline and the frame screws while someone is already up at the panels.
Part of the JAS operating playbook — including the half of the calendar you will use to hire another trade, because honest advice is given whole or not at all.