The short answer is rub flour on them. Just regular cheap baking flour seems to absorb the spicy oils. You probably want to wash your hands first to get off anything else, but if you’re chopping peppers or making hot sauce, sometimes there’s something still there that you can’t get rid of.
I grow peppers and make salsas and hot sauces. I also try to wear rubber gloves to avoid getting the pepper oils in between my fingers and other places that just burn forever. Sometimes those gloves break or the stuff flows down the back of the wrist while I’m working. Conventional wisdom that doesn’t work involves things like milk, although that’s like a spicy mouth suggestion usually.
The flour idea is kind of like putting your phone in rice if you drop it in water. Rice and flour both absorb liquids pretty readily. Salt does too. I haven’t tested that. I’m just sharing here that a good handful of flour on some hands that have been working with peppers solves some problems. t
You might get the same result dunking your hands in rice or salt. I haven’t tested that. Flour seemed cheaper to me but I haven’t checked.
Anyway, this seemed kind of like a new idea. I haven’t really checked other places. It’s possible other people got here before I did. This’ll just be more support for the idea, if that’s the case.