I have to replace the water pump and I see the 2 year old coolant is really filthy. I have not had much luck with commercial flushes. The idea of using Cascade dish washing machine soap as a flush is all over the 'net with pros and cons. I am concerned because I have an aluminum radiator and it says right on the box that aluminum pans may become discolored or damaged by this product. Yet, some swear by it. I'm thinking a radiator is a better grade alloy than a frying pan. What say ye?