From: pcdhobbs@gmail.com   
      
   >I know telescope mirrors are cleaned with CO2. Whether that's    
   >practical or possible for your needs... ???    
      
   Wow, really? A colleague of mine tried that as a cleaning technology for   
   chips, and wound up destroying them. I expect that'd get rid of the   
   fingerprints, for sure, but I'd be worried about the thermal shock   
   delaminating the coatings and maybe cracking    
   the surface.    
      
   I could see how it might be okay on quartz or Zerodur, but I'd be very leery   
   of CO2 snow on ordinary glass.   
      
   Do ordinary optics really survive that?    
      
   Cheers   
      
   Phil Hobbs   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)