On Friday, 4 February 2005 19:23:34 UTC+5:30, Simon  wrote:   
   > I need to clean out some partially blocked coolant passages inside an   
   > aluminium radiator.  The radiator is out of a railway locomotive and   
   > is not easily dismantled (it is all welded construction).   
   >   
   > I am told that sulphamic acid will remove the deposits - my concern is   
   > that it will do a fairly good job at removing the aluminium too.   
   >   
   > Apart from the obvious answer (i.e. start at 5% solution and work up   
   > gradually) does anyone have a suggestion as to what solution is the   
   > best compromise between removing oxidisation and time taken?   
   >   
   > Thanks in advance.   
   >   
   > Simon   
      
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