another factor, especially if you live in a warm and /or humid climate it is important to also get out of your shorts, washed off and out thoroughly and then wear cotton underpants ( yes I know they are not glamorous but it does help the area breath) and sleep with your bottom half bare or in loose cotton shorts to continue airing and drying out.
Another factor in saddle sores is toughening up the nether region by riding hours in the saddle, that of course with the usual caveat about saddle, bike fit and snugly fitting shorts.
marni
Katy, Texas
Trek Madone 6.5- "Red"
Trek Pilot 5.2- " Bebe"
"easily outrun by a chihuahua."