I think its worth checking with the manufacturer... sounds an@l, but I wash all my components bar the sail and board.
Harness, uni joint, extension etc - all in cold water.
Take the end out of the boom, wash everything in cold water rather than hot, leave the end out of the boom but the clips pressed in as per makers spec. For the boards, I open up the vents on hot days and leave a bit of paper rolled up in the vent to remind me.
Wetsuit also gets cold water only wash. And its dried flat roll out on a towel. Hanging them stretches them....puts em out of shape....Hot water kills wetsuits over time too. Doing this I have a steamer still going on eight years, and yes was used heaps. But now I'm too fat to wear it

Better if you have a bath and can swish it around and soak it, then final rinse.... and they say to use the wetsuit shampoo.... but mine seem to last regardless.... however they are more insulated... think there is silicon in that stuff.....
Polishing your board every now and then also gives you the chance to look over it, check it for nicks etc... not a bad habit... and opening your vent, check the rubber on the vent plug from time to time... you can get them from Clarke Rubber....better safe than sorry....
Cribbs said something about washing your sails in fresh water removing the salts, then people store them all winter (UK) and roll them out only to find mold and decay. The salt protects the sail or something.... at least mold won't grow on it.....something something...
I want my gear to last

*think I just stepped on a crack on the pavement - crap*