Can Copper Kitchen Molds withstand dishwasher heat?

I know you are not supposed to put Copper Kitchen Molds in a dishwasher, but what if I put them in without dish detergent?
I just recently moved and the top of all my Copper Kitchen Molds are caked with grease and dirt. In my new place the hot water in the sink does not get too hot, so I was wondering if I put them in the dishwasher without the detergent, would they be safe at that high temperature?

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