I've looked at the dishwasher detergents at a few of my local grocery stores, and all of them contain either ethoxylates or "fatty alcohol alkoxylates", which some brief googling tells me are a class of chemicals that include ethoxylates. I've been unable (even at specialty health food stores) to locate a dishwasher detergent that lacks this class of chemical. If you find a brand that doesn't contain it, please let me know.

I also looked at home-made detergent recipes, as we've had good luck making our laundry detergent, but the blog I looked at showed severe streaking and residue on their example dishwasher load. I can't say that appeals to me, either.