You are correct,Calcium,Lime and Rust remover. I first bring the engine to temp running off hose, Then remove hose and attach short hose connected to large funnel restart until all of the CLR has been picked up and shut off. Let sit for 10-15 minutes then flush out with hose. Afterwards run anti freeze throughout and get it all set for winter. I've been doing it since 2000 when I lived full time in FL. and inside of manifolds and risers and clean as can be. The solution exits my boat through the transom exhaust and it is nasty.
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