DDH: you may laugh but I actually got the idea here on the board: I take my helmet in the shower with me after a particurlarly hot/sweaty ride. I only use pure soap anyway so I just rinse the helmet under the shower, soap up the straps and pads and rinse everything out. I then hang the helmet on the shower head to dry before my next ride.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"