last time I had the thick white slim I used dish washing soap (not dishwasher soap but the stuff in the squeez bottle) and water through the system for a few days (yes while the computer was running) and it cleaned up the hoses so I imagine it cleaned up the rad. I let it run 24hrs, drained, ran another 24hrs, drained, ran strait water through a few times, and set it all back up with distilled water.
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