I'm surprised that no one here has talked about "Invisible Glove" or DuPont "Protek" (if they still make it). Invisible Glove is made by Blue Magic, Inc., in Cleveland Ohio. No other info on the tube..but I get it @ local hardware, auto parts stores.
I've used it for years. Some here may have also. It comes as cream..that you rub into hands, under nails..anywhere you don't want grease, paint, dirt to stick. Can get as funky as you want. Just wash off under warm water when through working..everything washes off.
One caveat: it's water soluble..so as long as what you're into is oil, varnish, dirt based..everything's okay. But if it's like water, alcohol based (read: antifreeze, brake fluid, et al.) then the stuff comes off.
Sure beats the heck out of scrubbing..ending up with perpetual black fingernails, etc. when wrenching a lot.
I though more knew..hope this lights some lights..
Ichi