ORIGINAL: ho2zoo
I use windshield washer fluid with a good squirt of dishwashing soap added. The soap helps cut the grease. Works well for me and washer fluid is about a dollar a gallon.[8D]
Remember to bring paper towels with you to the field.
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I start by wiping off all of the runny goo with a dry paper towel at the end of each flight. While I take it apart at the end of the day, I wipe it with de-natured ethanol. It is available at building supply stores, cost less than 90% isopropyl alcohol, and works better than isopropinol[8D]