The easiest way is to rinse the knife in clean fresh water after marine or chemical exposure. Make sure to dry your knife completely after rinsing.
You can oil the blade and the pivot area from time to time with any good, light oil such as WD-40. If the knife becomes encrusted with dirt or sand, it can be completely disassembled and cleaned out thoroughly.
Cleaning Light Colored Handles: Dish soap and water or Simple Green with a toothbrush.
If you take your knife apart we do recommend that you use a small drop (the size of a pinhead) Low or Medium strength LocTite on the threads of the pivot screw.
Sharpening your Emerson Knife