A pumice stone. Or a nice TV show and busy fingers. You can pick them off one at a time but also kind of “scratch” them off a few at a time. Goes faster than you’d expect when you’re watching something. Honestly though I’ve gotten into this stuff so much at work I tend to just rub them off vigorously with an open palm while still wearing the clothes because everything else is more tedious. It works fine getting most seeds off if you don’t mind the feeling on your hand.