Post by
AZhitman »
https://forums.nicoclub.com/azhitman-u113.html
Tue May 29, 2007 6:39 am
Both.
Soap it down good from both sides. High-pressure water (shoot from the INSIDE out), and then air hose as well.
Always try to clean radiator from the back side... Much easier if you just take it out of the car.