Thermochill rad flux cleanup

[Navanod]

Like many, I "thought" I had cleaned up the rad well and good with hot water and lotsa flushing and crazy shaking.

All it took was for my trusty MCP655 48hrs, and I start to see snowing in the res (not all the white stuff are bubbles)


The tygon started to cloud and deposits can be seen at the bends. That bright spot on the res's "paddle" is also a thick deposit of flux!
Ignored it for quite sometime but finally couldn't take it anymore and decided to do some major cleanup!

After much hot water soaking and pulling a test tube brush through the tubings, all I did was to brush the deposits into a nice pattern (in whichever way the brush hairs happened to run through)

Taking the advice of Xilikon (thank!), I grabbed some 70% ethanol from the lab I worked at and repeated the soak + brushing.
Crystal clear tubings!!
The thing was, just shaking with ethanol didn't quite got rid of the flux, brushing was still needed.

All other parts in the loop (cept the res, O rings and pump) were cleaned the same way, followed by distilled water rinse.

That got me worried bout the rad and res, since I can't quite brush the insides.
Rad's soaking in ethanol for 48hrs now and I'm trying to get a small brush for the res. May try soda water on the res since I can't use alcohol on it.

Here's the last and best part: I also cleaned up the coolant
I was using PC ICE...should've ran the leak test (cum flux dirt test) with distilled instead, mistake there

Not willing to throw away a full bottle of PC ICE, I collected and brought the murky bottle to my lab.
Poured the liquid into centrifuge tubes and gave them 15 minutes at 5000rpm in the spinner.
Was tempted to use the 13 000rpm monster centrifuge but after looking at the results of the 5000rpm, was convinced that its good enough





Check out the amount of greenish yellowish goo at the tip of the 50ml tubes

Hope this will be a warning and of help to people with new (thermochill) rads, to do a thorough cleaning, or end up like me