Webbo i thought it was only other brands of rads (XSPC, Feser etc) that you needed to use vinegar for?
Thought the Thermochills used a different type of flux and you only needed boiling water to clean it out?
They've only started using the other flux in the past 12 months IIRC ie - after this thread was posted.
Im sure Ive seen that picture before on a competitors forum W3bbo