If you don't use antifreeze, try using some water wetter or other anti-corrosion additive. Joe's DH3 writeup has a good recipe for using just Water Wetter (although he actually shows and uses a different generic brand). If you don't, be prepared for metal corrosion.
Also, if you use alcohol (not a bad idea), buy some methanol, not the isopropanol (I think that's spelled incorrectly). Methanol has the best thermal transfer characteristics of the alcohols, and you should be able to get it at a home improvement store in the paint stripping and solvent section.
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