>car, let it idle for 30 minutes, then flush.  It has no acid in it. (It has
>TSP - trisodium phosphate, and something bisulphate).  It only cost about 3
>bucks. 
I use citric acid to dissolve scale from my boiler, and have tried
CLR and it worked well.  
Anyone know of any warnings against using CLR in a radiator flush?
CLR is heavily advertised on TV to eliminate Calcium,Lime, and Rust hence
the name CLR.  Ingredients include citric acid.
mBrad 
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