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How important is it to get it sparkling clean?
I don't know whether regular radiator flush would help much. There isn't supposed to be oil in the cooling system so it probably doesn't have a lot of oil removal capacity. Dishwashing detergent or laundry soap made for front loading washers is what I would use plus maybe add a little TSP for the phosphate. But I wouldn't worry about it too much. What's a little oil going to hurt?
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