CLR will work, sure, but it clearly says DO NOT USE FOR ALUMINUM, COPPER OR BRASS. i just cleaned my rad with it (let it sit with a 50/50 mix of CLF / warm water for 30 mins) and ended up with a leaky core :shrug:
im still hoping some water just got splashed onto the fins but im 99% sure i need a new one lol. oh well....
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