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AS TJ noted - only steel will rust. The majority of the system is aluminum, and will corrode or oxidize. The deposits are usually from using regular water with minerals that will eventually solidify in the system. That's why they recommend distilled water. Coolant also has buffers to prevent corrosion, but they eventually wear out.
The risk you run when using a strong cooling system cleaner is dislodged particles that can block the small passages in the radiator. I did it once and it blocked the heater core.
If you were going to clean it, I would use a recommended cleaner but follow the directions closely. If there is any question after using it, a radiator shop could clean and test the radiator to make sure it's flowing properly.
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