The right way to clean a deck in Florida is to soft wash it: apply the correct cleaning solution for wood or composite, let it lift the mold and grime, and rinse at low pressure. High pressure splinters wood and damages composite, so on decks the chemistry does the work while pressure stays gentle. For wood, cleaning is also the first step before resealing.

Why soft washing, not high pressure?

It is tempting to blast a deck with a pressure washer, but wood fibers tear, fur up, and gouge under high pressure, and composite boards can be permanently marred, which voids some warranties. Soft washing uses low pressure and a cleaning solution that kills mold, mildew, and algae at the root. The deck comes out evenly clean without the damage, and the growth stays gone longer than after a surface-only blast.

Cleaning a wood deck

  1. Clear the deck and pre-soak surrounding plants.
  2. Apply a wood-safe cleaner, often a sodium percarbonate or controlled hypochlorite solution, to kill mold and lift gray oxidation.
  3. Let it dwell so it works into the grain.
  4. Rinse at low pressure, following the grain, and detail the railings and steps.
  5. Let the wood dry fully before any sealing.

Cleaning restores the natural tone, but wood needs protection. In Florida sun, plan to reseal or restain once water stops beading, typically every 1 to 3 years. Never seal over a dirty or mildewed deck, because that traps growth under the finish where it keeps working.

Cleaning a composite deck

Composite resists rot but still grows surface mold in its grain texture, especially in shade. Use a composite-safe cleaner and soft wash at low pressure. Avoid harsh scrubbing that can scratch the cap layer. Composite does not need sealing, so cleaning alone keeps it looking new. Check the board manufacturer's guidance, which typically calls for gentle cleaning rather than high pressure, and follow it to keep any warranty intact.

The correct chemistry matters

  • Mold and algae: a controlled cleaning solution kills at the root; rinsing alone does not.
  • Tannin stains from oaks and palms need the right cleaner to lift brown shadows.
  • Rust from fasteners or furniture needs a rust-specific treatment.
  • Plant protection: pre-soak and rinse landscaping, since deck runoff hits your beds.

Our deck cleaning service matches the solution to the material and protects your surroundings.

Florida-specific tips

Clean during a dry stretch so wood can fully dry before sealing and so rain does not wash away the finish. Screen enclosures trap humidity, so screened decks grow mold faster and benefit from more frequent cleaning. Near the coast, salt film adds to the buildup, so coastal decks need attention sooner. Homeowners with pool-side decks often pair deck work with pool deck cleaning so the whole outdoor space is done at once.

Cleaning is step one of refinishing

If your goal is a fresh stain or seal, remember that the cleaning quality determines the finish quality. A properly cleaned, mold-free, fully dry deck takes stain evenly and lets it bond, while a rushed or dirty deck leads to blotchy color and early peeling. This is why professionals treat cleaning and prep as the foundation of any refinishing job, not an afterthought.

DIY or hire a pro?

A small composite deck can be cleaned with care and a garden-hose-pressure approach. Wood decks, and any deck you plan to reseal, are where professionals prevent damage and get an even result that takes the finish well. The gentle pressure and correct chemistry are easy to get wrong with a rental machine, and mistakes on wood are slow and costly to undo.

Timing your deck project in Florida

When you clean and refinish matters here. The drier, cooler months from late fall through spring are ideal, because wood needs a stretch without heavy rain to dry fully before sealing, and sealer needs dry, moderate conditions to cure properly. Summer's daily downpours and intense midday heat make timing trickier, since solutions can dry before they work and fresh sealer can be washed out by an afternoon storm. Aim for cleaning early in the day and check the forecast for a dry window. If you are planning to reseal, build in a couple of dry days between cleaning and sealing. A professional will schedule around the weather so your deck gets the best possible result.

Want your deck cleaned the right way? Call MainSail Pressure Washing at (772) 559-2666 for a free estimate anywhere on the Treasure Coast.