Has anyone placed these in the dishwasher? And they've been OK?The use and care says "to maintain appearance hand wash only". I am surprised since silicone should be safe for the dishwasher, I thought. Even the new stretch fit bowl covers are OK for the dishwasher. Since it says "maintain appearance", maybe they fade?I put the silicone hot pad/trivets in the dishwasher all the time.Any thoughts?