Radiator stop leak......how do gou get rid of it..

[rjustman]

I bought a truck( one that I have posted about earlier,having the adapter plate leak) anyways..I was pulling my 5th wheel through the mountains and overheated..while it was puking coolant out of the overflow tank I noticed a bunch of rusty colored stuff..looked at it and it's like a gummy substance which come to find out is that stop leak. Is there any kind of flush or anything I can do to toget that stuff out?? That pc-9 and,re other Ford stuff,will it eat it up and get it out if I flush it??

Any helps appreciated.

Thanks

Richard

[J17HENRY]

Start with water can't hurt.

[95cummins5.9]

Purple power, just don't use it full strength. Or bye bye radiator.

[rjustman]

I've tried water..tried CLR also because last guy used water in it due to leak..and didn't wanna waste money on dexcool or any anti freeze for,that matter..so it had a little rust..what would I dilute the purple power to?? I was going to try the old 2 stage coolant flush from prestone ..or the regular powder dishwasher detergent..
I've been tossing the idea around of getting a new radiator anyways so if I go a little aggressive I'm ok with it..

[Leiffi]

Citric acid, about 5% mix.

[rjustman]

Citric and distilled water or does it matter?? Or could I just put it in with the coolant that's already in it..

Thanks for suggestions guys