Rinsing helps, but only if it is done properly
Fresh water rinsing genuinely reduces salt accumulation and it is the single most effective thing most operations can do. The catch is that a careless rinse drives water into places it does not belong and creates the exact problem it was meant to prevent.
Keep pressure washers away from electrical connectors, seals, bearings and the operator compartment. Low pressure and a decent volume of water beats a narrow high pressure jet for this job. And let the machine dry properly rather than parking it wet.
On electric machines be especially careful around the battery compartment, connectors and controller. Water and salt in a controller is an expensive lesson.
Adjust the schedule, not just the routine
Manufacturer service intervals assume a reasonably ordinary environment. A machine in a salt environment is not in one, and the sensible response is to shorten intervals rather than run to a schedule written for a warehouse in the middle of the state.
Add specific coastal items to what gets checked: connectors opened and inspected rather than glanced at, brakes looked at more often, chains examined for corrosion as well as elongation, and rods checked for pitting before the seals fail rather than after.
Protective measures help too. Dielectric grease on connectors, corrosion inhibitor on exposed metal, and keeping machines under cover when they are not working all buy real time. None of it stops salt, but all of it slows it down.
Marine and harbor forklifts specifically
Large marine and harbor machines carry all of the above plus their own complications: heavier masts and attachments, higher loads, and often work patterns that alternate between hard use and sitting idle for stretches.
A machine that sits between busy periods in a salt environment is in the worst of both worlds. Nothing is moving to shed moisture, and salt is working on it the whole time. Idle time near the coast is not rest for a machine.
If you are running this sort of equipment, say so when you call, including capacity, attachment and how it is used. It changes what we bring and what we look at first.