I believe that saddle sores/rashes are due to bacteria ... at least to a large degree. I have never really dealt with the issues of how to actively avoid the rash problems, but here are some thoughts:
Main problem: You cannot shower and/or wash your bike shorts every day - especially if you are on a tight budget and doing camping to save money.
I read that one should use chamois cream or petroleum jelly. I once tried using petroleum jelly for 1 week but I got rashes anyway. I haven't tried specific chamois creams but I suppose they leave some sort of greasy layer on the skin/pad. Basically what I don't like about creams are the fact that they clog up the chamois/pad in the bike short unless the product is 100% water based. So, when you apply the cream every morning, more and more of that stuff clogs up the pad ... something I would avoid. The more you put on, the less moisture the pad can soak up and all sweat stays between your skin and the greasy layer on the pad (and cannot escape).
Then I got a totally different thought. Why not use hand sanitizer or baby/wet wipes instead? Instead of applying cream, you clean yourself "down there" every night before sleep to kill all bacteria/germs. This stuff evaporates very fast (within seconds). Then, you should also be able to spray alcohol on the pad of the bike shorts - to kill the bacteria in the pad...however I don't know if this is a bit far out. Anyhow, that way the shorts and you stay clean for a long time.
So, has anyone been using the hand sanitizer/wet wipe method? I would be happy to get some feedback...or just comments. Maybe its a bad method?