Don't do it! I attempted this with my old Chevy Luv's radiator. Yes it cleaned the fins-AND severely bent them. Using a radiator fin I was able to straighten most of them,but not without damaging some further.
I will never again use anything but a garden hose to flush the fins, and that by maintaining a safe distance between the two.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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