Have always used the unscented stuff. Hard to find. A name brand had it and discontinued it several years ago (happens to a lot of products my wife and I like), but I found Kroger (grocery store) brand had an unscented version, so that's what I use.
As for cleaning the dishwasher, we dump a container ot Tang in it every spring and fall. This is according to The Appliance Doctor, who had an appliance store in the Detroit area for many years.
Hmmm, maybe I should try the Tang in the washing machine?