EWIS anyone ?

Ketchup who would have thunk it lol.

I actually cleaned out a copper / brass radiator that was 90% plugged with rust from somebody running a car with just water in it using a couple 2 liters of coca cola. Layed it flat with the upper and lower hose connections facing up, and filled it up with soda. I let it sit for 2 weeks, and then flushed it out with hot water. The mild acid in the soda cleaned the copper and brass and loosened and got rid of the rust plugging the passageways.