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I use Evapo Rust so I am familiar with the product. I just have never used it in a cooling system that is connected and joined to other components by access of gaskets and such. This being the case I personally would not use ER in the system fearing it would intrude itself into these areas...

Tim - in the truck dealership shops and here and at home I always use Liquid laundry soap. For an 8 gallon system I have used a full cup of LIQUID not powder good laundry soap. Put this in your coolant as is - run will sufficient time - removed cap as a normal smart person would being cautious...