What should I use to clean a gunked up radiator

[Ferio_vti]

Hey guys,

planning to pull out my radiator to clean it. The stupid power steering cooler in front of the rad leaked and now a good part of the bottom of the radiator is all clogged and dirty.
what is the safest thing to use to clean a radiator?
I've read some people using brake fluid cleaner or oven cleaner.
What is safest thing to apply to the fins? Simple Green is caustic for the aluminum fins.

[Abeo]

Brake clean only. Don't pressure wash it, or you'll bend the fins over. Oven cleaner will eat the aluminum, much much faster than simple green ever could.

[Ferio_vti]

ok, thanks.
However, some over spray of brake cleaner onto plastics and rubbers should be ok?

[ExtraSlow]

Try to minimize how much brake cleaner you get into any rubber, plastic or painted parts, and rinse well immediately afterwards.