11-21-2011, 12:06 AM
(This post was last modified: 03-28-2012, 07:40 AM by Omniscient.)
There's stuff made just for this eventuality. It's called a radiator or the cooling system flush. Basically, it's cleaner without the foaming agent. You could rinse with washing-up liquid, but you have wash for weeks to get rid of bubbles.