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You may get all the loose deposits, but trust me, you can't get it completely clean. I work at a little shop called Riverside Repair..& RADIATOR! That's what we do. I see this sort of thing happen all the time! Sure, you can "flush" it yourself, and get a good load of s*** out of it, but that doesn't mean it is spotless. Even our Wynn's coolant flush machine can't get 'em perfect, just "pretty clean". If you popped the end-tanks off any old radiator, sure you could flush plenty of crud out, but there are deposits that WILL NOT come loose with just running water. CLR is not a bad idea. I can't see this harming the radiator any. If you want to be 100% sure the radiator is clean, it needs to be disassembled and rod out. Don't mean to be a pessimist, but I'm just letting you know what years of experience has taught me!
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