What is your favorite Rad flush ?

[Canadian1968]

What is preference for Radiator Flush ?  I need to put in a new coolant sensor so I will be dropping the coolant. I noticed last year peaking in the top of the rad, I can see some scum/ scale build up inside . Nothing crazy by any means .  The engine itself is new build so I am worried about the block more so the rad as it was used unit that I picked up.

What's do you guys like to use ?

[TexasStroker]

I bought this for my truck last year:
https://www.designengineering.com/radiator-relief-flush/

That said, you can waltz in anywhere and get a Prestone or Peak flush for about 1/3 of the price.

[b5blue]

"Fleetguard Restore Plus" acid based chelating cleaner. (Uses phosphoric acid.)

[Canadian1968]

thanks for the opinions guys !