XPost: alt.home.repair   
   From: invalid@invalid.invalid   
      
   Scott Dorsey wrote:   
      
   > Put a small puddle of rainwater on a piece of glass, then let it evaporate   
   > inside in a clean and dry place.  Does it leave any residue?  Does it leave   
   > a whole lot of residue?  Does it leave corrosive residue?   
      
   You'd need a lot more than a puddle to see the deposits, although you could   
   run that experiment with a glass tea kettle to boil the rainwater dry.   
      
   As for being corrosive, rain has long stopped being corrosive at the levels   
   that anyone would notice in their lifetime, even on marble & limestone.   
      
   While pH 5.6 is acidic, it's mostly carbonic acid which is a weak acid.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)