I beleive any auto store will sell a good radiator flush .be sure to rinse it according to the instructions on the bottle,leave the radiator in the unit and flush the whole cooling system .....otherwsie you've only done half the job....once cleaned use a good antifreeze and distilled water to avoid the mineral issue all together ......disimilar metals also can react with water and anitfreeze ,your owners manual,may tell you what type of antifreeze is required....Good Luck,Jim