A.L.
Hi C.! We have the same set. I have put them into the dishwasher a couple of times..and they DO fade the coloring on the front a little bit. It doesn't affect the magneticism, but it takes some of the colored paint off. Otherwise I use the bleach wipes, but it is really hard to get in all of the little cracks with those. I think submersing them in a mild detergent might work...and maybe wouldnt' take the coloring off. I use my dishwashers' heated dry, too...which could have had something to do with the paint coming off.