you know, I don't know the answer to this one. you are right about the micellular strucutre and function of soap and detergent, but as to the mechanics of surface tension and additives effect on it, I will have to do some searching to see if I can find an answer.
The problems with detergents is that they would be incompatable with the additives in antifreeze, sequestering them from the aqueous solution and eliminating thier benificial properties. Although some kind of surficant or phase transfer agent such as tetraocyl ammonium chloride (or hydroxide) might work.
someone remind me in a day or two if I ahve not got back to you about this... Interesting...