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I'm going to go out on a limb and suggest that LNT principles often have more to do with simple aesthetics and perception than anything else. We're not talking phosphates here.

I agree.


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Alternately, I do a non-soap rinse in the lake (e.g., swim) to feel refreshed.

To go along with DB's comment above, I suspect the non-soap rinse contributed almost as many contaminants as a rinse with soap would produce.  Which in neither case is a problem.  But I realize most do not share my opinion.