There's some old Blue Devil inside the radiator of my girlfriends '03 civic. Appears to be a pretty decent amount in the top of it, can I expect there to be a lot more throughout the whole rest of the radiator?

Either way, lots or little of it, I want to flush it all out of there. I've seen some methods on how to flush a radiator but will it work on Blue Devil considering Blue Devil's nature?

 

If this was found in your gf's car than expect to replace the motor. I've read reviews stating it works but I don't really recommend it because it can clog the system.

 

Wrong Civic forum.