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I use renolite aqua 2

High quality water-resistant grease
RENOLIT AQUA 2 is a water-resistant grease suitable for all applications where resistance to water, salt water, or cutting fluids, either by submersion or wash off is required.
It is manufactured to DEF STAN 91-34/1 and NATO G-460 for lubrication and protection against corrosion of mechanisms submerged in seawater or subject to
wave action and the washing effect of heavy seas.
Industrial applications subject to water or cutting fluid wash off.
Automotive, quarry and mining applications in wet areas.
Boats and boat trailers.
Suitable for stern tube greasing.
Bearings subject to high alkalinity or degreasing fluids and washes.
Booms on cranes, wire ropes etc.

As it was what the chandler stocked.