Cleaning a Radiator
 

Hy few days ago i get '87 Opel Copper radiator. What is the best way to clean all dirts from radiator?

you should put the radiator in a few chemical baths to get it all dirt off it. I don't know what stuff you need though

use gazoline or vinegar and rinse it well,

fill the rad with gazoline and let it rest over a night ( or use vinegar )

What about boiled water mixed with vinegar? Or only vinegar?

I don't know

heat the radiator anyway, the high temperature helps the removal of the dirt

and while you're at it you can add your vidcard to the boiling water to clean it out also :p

LOL, great point. strange the RMA service even didn't notice the card wasn't dusty after more then 2 years :D

How about automotive radiator cleaner?
Reverse flushing will also get the scaled deposit out.