Open Question: What are good ways to keep clean on a camping trip?

On a trip in a desert, what are good ways to keep clean for approximately a week assuming that you will not be able to shower? (other than saying to get baby wipes...) E.g. I heard that putting small amounts of baby powder in your hair helps dry up the grease... stuff like that) Also, what are good ways of relief to extreme weather conditions... above 90 degrees in the day, and below 40 degrees at night?

Source:
http://answers.yahoo.com/question/index?qid=20110323002557AA7dKaM

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