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Message: <blockquote data-quote="Tragic00" data-source="post: 7225875" data-attributes="member: 588510">Hello all,I recently posted here asking about flushing a cooling system. I ended up back flushing it at first, which helped some but not enough. So from there I used Prestone Super Flush (just sodium citrate), cleaned a lot of brown stuff out, back flush 3-4 times total. Which I can still see stuff gummed up in the radiator fins. It looks as if a lite brown playdoe style stuff.I know prior to me doing this flush, it prolly hasn't been done in at least 10 years (it's a 95), besides just adding water or coolant.My question is, what can I use that will be stronger, but not damaging to my engine to clear it out? I'm starting to look around at prices on raidiators and heatercores. But I am just not looking forward to changing the heater core.</blockquote>

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