You know what works very nicely for cleaning up fingers and small amounts of excess epoxy.... the little alcohol wipes you can buy in the drugstore. They come sealed in a pouch, and you get 50-100 in a box. I keep a box on my bench and just rip open a pouch and have a small alcohol soaked wipe to wipe fingers or excess epoxy up. Of course they are small and wont work well for gross amounts, but very convenient for small amounts.

Just a thought ( I also keep a can of alcohol with some paper towels handy for large epoxy clean ups but the small wipes work for 98%of the time)