If your hands are a bit sticky from working with the resin, start by washing them with vinegar. Once you have gotten the resin off your hands, you can switch over to some soap and water. If you have any patches of resin left over that are harder to remove, you can use rubbing alcohol to remove them. Be advised, however, that this should only be done when absolutely required since alcohol can easily dry out the skin on your hands. You can also get safer hand-cleaning agents from craft and hardware stores. Prevention is, however, better than cure. You should always ensure that your hands are covered with nitrile gloves whenever you are working with epoxy resin.