I've been noticing a rank odor coming from my helmet lately. Seems that my sweat has been absorbed into the pads, and is re-activated each time I ride. I get to work and my head smells funny. I get home and my girlfriend exclaims, "ewe!"

How can I solve this smelly dilemma? Should I remove my helmet pads and wash them after any sweaty ride? Should I wear some sort of hood layer under the helmet? Are there better pads that don't absorb sweat?

Thanks for any help.