Dock Cleaning in Saint Augustine, FL

A dirty dock is mostly a safety problem. Algae and biofilm on wet decking are genuinely slick — closer to ice than to a wet sidewalk — and a dock is a place where people carry coolers, walk barefoot, and step from a moving boat. Appearance is the reason people call; footing is the reason it matters.

What actually grows on a St. Johns County dock

• Green algae on shaded and constantly damp sections, and the dark biofilm that makes boards slick
• Mildew and mould in the grain, particularly on north-facing and tree-shaded runs
• Bird droppings — heaviest on pilings, rails and anything a pelican or heron perches on, and acidic enough to mark wood and finishes
• Salt deposits that crystallise in the grain as the surface dries
• Tannin bleed and rust staining bleeding out around fasteners

Pressure washing is how most docks get damaged

This is the single most useful thing to understand before you hire anyone. Wood is not uniform: the soft spring growth between the harder grain lines erodes far more easily. A pressure washer held close, or run at high pressure, blasts that soft wood away and leaves a furred surface that looks clean while wet and turns into splinters within a year. It also drives water deep into the boards.

The right approach on wood is a soft wash: an appropriate cleaner applied and given time to work chemically, agitated where needed, then rinsed at low pressure. Chemistry does the cleaning; the water only removes what the chemistry loosened.

When you are getting quotes, ask what pressure they use on decking and whether they are cleaning chemically or mechanically. Somebody who answers in PSI without qualification is telling you something.

Everything you rinse off goes into the water

A dock is the one surface where the runoff has nowhere else to go. Whatever comes off the boards ends up in the Matanzas, the Tolomato or the St. Johns. That is worth caring about on its own terms, and it is also worth asking about — what product is being used, whether it is appropriate for use over water, and how they manage the rinse. A contractor who has thought about it will have an answer ready.

Composite and hardwood need different handling

Composite decking cleans well but should not be treated like wood: high pressure can permanently mar the surface texture, and some cleaners will discolour it. Manufacturers publish cleaning guidance for a reason, and it is worth following. Dense tropical hardwoods like ipe clean readily but grey quickly again unless a UV-blocking oil goes on afterwards.

Clean first if you are sealing

Nothing bonds to a surface carrying algae, mildew and salt, so cleaning is the first step of any sealing job rather than a separate service. If sealing is the eventual plan, it is worth having the same contractor do both and sequencing them properly — the dock needs a real dry window between the two, which in this climate takes planning around weather and tide rather than a same-afternoon turnaround.

How often

Most docks here want cleaning annually; heavily shaded ones, docks under bird traffic, and anything near constantly damp marsh often want it twice a year. The practical trigger is not the calendar — it is the first time the boards feel slick underfoot when wet.

Before scheduling, identify the decking material and ask how runoff, nearby vegetation, boats and the surrounding water will be protected.