Avoid any solvents, they are more toxic than the 5200.
Hot water and dish soap to soften the skin,
then use a nylon scrubbing pad to scour your hands.
just like taking cooked on grease from the baking pan.
Next time, use gloves!
Remember rule #1: If you're gettin' dirty, y'er doin' it wrong!
For making super clean installs, and cleaning it off your hands before it dries, use WD-40! I'm not sure why it works, but it makes all installs super easy. Just apply, install fittings, then spray WD-40 on a rag and wipe off the extra mess.
For dried on skin, I've always used acetone cause I'm not patient, but I did use the "environmentally safer" paint thinner once and it worked well.