I've read in several places recently (naturally, can't remember exactly where) that NO edged equipment should be put in the dishwasher because the hot detergent is strong enough to eventually erode the edge. Any references?
I did look at a Henckels knife with a plastic handle the other day in a store and noted that they recommended against dishwashering it.
Anyway, being an alarmist, I've quit putting knives, peelers, microplanes, mandolines, and graters in the D/W.
It's not really much more trouble, I just insist my wife wash them all by hand.
Mike