I am trying to find a way to get the radiator soaked into something that would lift the slime from the inside of it, so I can just blast it out with water and compressed air.  I have a copper radiator and an aluminium one.  They are both loaded with slime.  
I know, I can buy a new one.  That's not the question now.  There are many of us on the list who would like to know this.  And maybe it is a good practice to rinse it sometimes, I guess.  It can be done while still in the car.  Then we would not have to replace it.
I think of something acid or alkali kind.  Maybe there is one that is already being used long time and I just don't know of.  One maybe for aluminum one for others.
Anyone?