I like to climb, which is not to say I'm good at it, just that I've sweated a whoooole lot in my helmet in the last 6+ months. The straps are stiff and crusty and the whole thing smells vaguely like a beach on a hot day. Salty and funky and a bit like a scary sea-creature from the deep depths. Rotting.
Wash it in.... the bathtub? Dry it in... the sun?