i suggest rinsing it, drying it, and the putting it in a plastic bag in the freezer to kill bacteria. if the freezer works for shoes, it will work for a helmet!
Wear it in the shower after the ride. If you need it again that day or its not very warm you can dry the chin strap and pads with a towel to speed the drying.
The pads are usually held in place by velcro and can be taken out and washed periodically. Leave the salt stains on your chin straps, though–that way people can tell you’re not a poseur.