White vinegar is good, as recommended above.
I actually used UV dye for a period of time and switched over to plain distilled afterwards, having flushed the rad ''properly'' in between as well. I used hot water and it came out clear. After I took the distilled loop apart for another upgrade, I did hot water flushes again and once again, it was clear. Took a flashlight and discovered there was actually blue gunk inside, even after all those hot water flushes and a year of plain distilled running through. A quick vinegar fill and it came out dark blue. I've done some more quick vinegar flushes after this one, even one with salt through it (supposedly aggresive for metals, be careful) and one boiling hot.
The thing is, vinegar is useful if you know how to use it. I'm not sure how long you can actually leave it in before it starts wrecking your rad beyond any recognition, but 15 minutes shouldn't do any harm. Dye is obviously different from flux, but you get the point.



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My Thermochills rocks with vinegar well. 
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