True. I used to put my non-stick pans into the dishwasher. And they survive for quite some time... But they'll degrade. And I bought a new one and stopped doing it. Usually non-stick coating, wood, aluminium and things with mechanincs inside are a bad idea. And most of the things that clearly state they aren't diswasher safe. The rest should state if it's diswasher safe. Either in the manual or on a small stamp somewhere on the product.