I just bought an original yellow 1800ES. The water where I live is very hard, and the best facility I have for washing is my very own garden hose. (The local power wash leaves a nice even layer of crusty, soapy grey snot all over.)<P>Is there anything that can neutralize hard water when I rinse the car? Also, are any of the products that keep getting mentioned in this forum, inappropriate for very old and slightly oxidized paint?<P>The finish is totally salvageable--it looks great when it's wet--but I think it needs some serious loving from the ground up.<P>Any good ideas?