If you sometimes hold items to spray them like I do, you'll occasionally overspray, and like I've just done, you'll end up with black (other colours are available) fingertips. It's not very pretty and can rub off on your clothes and precious furnishing, even after it has dried.
I have a box of wet wipes on the top of my spray booth that you'd use to clean up a baby's bum, which isn't a reflection of my modelling skills... I hope? Once you've finished spraying, grab one and use it to wipe the paint off your hands, knees and other areas. It works with all sorts of paint, including lacquers and thinners-based primers like Alclad. I was quite impressed with how effective it was, and although I've used it before, I'd forgotten about it until now.
Thought I'd share it