Flushing radiators with Cola.
Never heard of it before but I just came to think that stuff contains citric and phosphorous acids. I have a couple RX480 radiators that I used eons ago, they are a bit green inside but not too bad. Inclined to try it.
Anyone else tried it? Not a fan of the hype so I reckon for cleaning you'll find the chemicals you need without a costly sticker on it.
NOTE This is before building the loop and the rads are maybe 5 years old pre used.