I've been looking at antifreeze and finally found Coldstream, it's not even on Comma's website

What am I better using? Coldstream, coldmaster or XTream Red??? The XTream red says it has protection for aluminium engines???
Edit to add: What about flushing the system? Another renault forum recommends using Stergene (a handwashing liquid washing powder if you know what I mean). Radflush??? The coolant is BOGGING!
Lindsey