I guess I'm just cheap. As a hand cleaner I just use a quick squirt of what I use to clean my planes with (windshield washer fluid with a little Dawn dishwashing liquid in it) and wipe my hands with a paper towel.

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Good idea! I never thought of using Dawn but I was a taxidermist for years and can tell you it does a great job of getting oil out of dead ducks. It ought to tackle castor oil quite well...[8D]