Dishwashers use a combination of enzymes (in the detergent) that breakdown food, heat, and abrasion to clean dishes. Don't put anything nonstick in one unless you like Teflon poisoning or your nonstick items to be stick items. Steel is fine, and aluminum will oxidize and look bad, but will still work. I assume the basket isn't plastic, so no worries there, but don't put melamine in the dishwasher either.