I know it sounds stupid, but I just removed the wire ramps from my cactus jacks out of the disherwasher!

They were absolutley filthy, and have come out better than new!

You could try that first, mine went it for the 30 min short cycle with the normal dishwasher detergent.

PS I also put in all my clear plastic ramps (even with stickers on them) and they came out spot on as well, all that was needed was a quick going over with the perspex polish to get rid of the water marks.

Cheers Angelo