Salt crystal build up

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I have a 2005 2520 pilothouse and usually close all windows and ports when not in use. I noticed that there is a build up of salt crystals on the aluminum window frames and aluminum seat supports. Anybody have a similar experience. Hopefully, someone may have discovered a cure. If I were to make a guess, I think it is because there is a lack of air in circulation. Thanks for your help
Ralph

 

[Megabyte]

Good ventilation is key.

Corrosion protection can be had by using Woodys Wax on the metal surfaces.
Easy to do as part of your normal cleaning and maintenance.