After 26 years in this business let me tell you so much has improved.  I remember one week a hot sumer week that I did not see or even come close to a shower.  I could not even stand myself.  My other half did of course have access to showers .......we weren't speakng much by the end of that trip.  After that I have learned to take a wash cloth/hand towel with me into the bath room EVERY time I stop and even soap in a baggie.( love them baggies) at least it helps to wash face neck and arms and such.  I have learned to wash out things when I find a private bathroom and tuck them away till I get back to the truck to hang them to dry.  well enough for now.  talk more later