The way these baking sheets are designed doesn't work well in the dishwasher. Every time I wash them and remove them from the dishwasher, brown drippings spill out. The lip of the sheets are folded in and for some reason the water that gets in between those creases turns brown and it doesn't dry up quick enough. I've never experienced anything like that before with baking sheets unless there's still food on the sheet. They work just fine outside of that.