I'm sorry! You want to clean the radiator fins, you have to drain the cooling fluid and properly store it, or dispose it, depending on it's next use. Then you have to remove the radiator from the engine bay - level 2/5 dificulty. The video just shows a good deal of water waste for a marginal result; plus a good way to rust a few more nuts, bolts and damage of electrical parts. You already showed some rusty bolts. So for a DIY video what's the rush by doing the job with the part in the same place where it operates?