I have been using a homemade version of dishwasher powder for awhile made from a 1:1 ratio of baking soda to Borax. I am unimpressed. I tried adding salt. Still not happy. My glasses are cloudy coated (can scratch it with my fingernail so its not etching) and some dishes just do not come out clean.
I am unhappy with this recipe and so far all the homemade recipes I can find are pretty close to this with perhaps citric acid added.
Thus, the great dishwasher powder experiment of May 2007 came to and ignomious end...with me buying some chlorine free stuff at Zellers on a major sale discount (Amilya's Soapworks). Sweet.