100% this. Engineer here. Putting anything other than ceramic, glass, metal, or very high temp silicones in the dishwasher is just ridiculously bad for your stuff / you. Plastic leaches, sharp blades dull. You’re poisoning yourself with micro plastics mainly. Any of those nylons or cheap PET/PETE/PETT variants are all prone to be mislabeled and even if they don’t melt they can leach.

Yes blades are metal but they’re sharp and handles often aren’t metal. Ergonomics yo. It takes seconds.

Hand. Wash. Please.