Okay, no posts back on this, so I went out to the Net to do some research. Didn't find anything that seemed great, except these formulas for cleaning vinyl records from Steve Rochlin's great site, Enjoy the Music. I don't like the idea of strongly alcoholic fluids, which could remove my Z

, but I think these have potential, and they cost pennies to the gallon versus the commercial stuff of unknown content.
distilled water alcohol detergent
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1) 1 part 1 part isopropyl none
2) 1 part 1 part isopropyl a drop of Triton X-100
3) 1 quart 1 pint denatured 10 drops Photoflo
4) 3 parts 1 part a few drops
5) 3 parts 1 part rubbing a few drops
6) 4 parts 1 part ethanol some