well how do u fight dysentery or the bubonic plague then?I agree with the article. We shouldn't wash cars. Actually, humans waste a whole lot more water washing themselves, flushing toilettes, and washing their clothes.
Personally, I stopped showering and washing my clothes sometime around 2001. My clothes are filthy, I'm filthy, and my cars are filthy.
Instead of wasting all that water flushing, just do what I do - use your backyard as a toilet. It's good for the environment - and actually what nature intended.