Both methods use water to remove marine growth, but they work in fundamentally different ways and produce very different results on your hull.
Barnacle King offers both as part of its service lineup, and understanding when each one is appropriate helps you avoid unnecessary cost or damage.
How Each Method Works
Pressure washing blasts water at high velocity against a surface to knock growth loose. It’s effective for above-waterline cleaning and for removing soft fouling from hauled boats.
The force is mechanical, and the cleaning power comes from the speed and volume of water hitting the surface. Most marine applications use settings between 2,000 and 3,000 PSI with a wide-angle nozzle to balance cleaning power with surface safety.
Cavitation cleaning works underwater using ultrasonic waves that generate microscopic bubbles. When those bubbles collapse against a fouled surface, the energy released breaks the bond between the growth and the hull.
There’s no high-pressure stream involved, and the tool doesn’t scrape or abrade the surface. The cleaning happens at the molecular level of the bond itself.
Where Pressure Washing Falls Short
Pressure washing has a narrow effective range. Too low and it won’t remove hardened growth. Too high and it strips paint, etches gelcoat, or damages wood.
On a hauled boat with light fouling, a skilled operator can get good results. But on hardened barnacles, pressure washing alone often isn’t enough, and cranking up the PSI to compensate creates more problems than it solves.
Pressure washing also can’t be done effectively underwater, which means the boat needs to be hauled for the work. That adds haul-out fees, yard time, and downtime to the cost of what might seem like a cheaper cleaning method.
The University of Florida’s IFAS Extension has published guidance on marine maintenance practices for Florida boaters, and the general consensus is that in-water cleaning methods that avoid harsh mechanical force are better for both the vessel and the surrounding environment.
When to Use Which
Pressure washing makes sense as a first step during a haul-out, clearing loose debris and soft growth before applying a hull cleaner or doing paint work. It’s a surface-prep tool more than a standalone cleaning method for heavy fouling.
Cavitation cleaning is the better choice for removing hardened growth in the water, protecting bottom paint, and cleaning precision components like propellers and shafts. It works on the boat where it sits, with no haul-out required.
For boats on a regular maintenance schedule, standard brush hull cleaning handles most visits. Cavitation cleaning steps in when the growth has gotten ahead of that schedule or when the surfaces involved need more care than a brush can safely provide.
If you’re not sure which method your boat needs, reach out to the team and they can recommend the right approach based on what’s actually on your hull.