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I was doing some research on what stuff would help flush the crud out my coolant system. I found that "pure Citric Acid" is aggressive enough to dissolve the dexcool sludge that lined my radiator hoses.
Interesting. My civie dggm had a very bad sludge problem. I musta used 4 cans of the rad cleaner on it in the same fashion. I forget exactly what acid it was. Warning however, running straight water will blow the water pump seal, doh ! There is a bottle of water pump lube you can throw in with your acid and water if you wanna go that way.
 
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