With a spyderco military, sebenza, and now my Ritter grip I swim in the ocean, swim in the pool, wear them IWB against my skin on extended mtb rides.
After the bike rides they come out with sweat beaded on the blade, even inside the handle. I just rinse them out with tap water, wipe them dry with a towel, and then try and blow out as much water as I can with my lungs.
For the sebenza and military it has worked for 4+ years w/o a problem. I bought the Ritter when it first came out (over a year now?) and it hasn't had any problems either. I rarely lube them.