There have been several threads posted recently concerning overheating radiators. One of the best products that I've ever used was DuPont's #7 Radiator Cleaner, which is no longer available.
O-D (Dave) has mentioned it several times and has posted on the
AACA Forum (3rd post) how simple it is to use. The
oxalic acid is available on Amazon for $9 with free shipping and ordinary baking soda is a cheap source for the sodium bicarbonate used to neutralize the acid.
Oxalic acid is not a strong acid and can be safely used by wearing gloves, eye glasses or protective splash shield and by taking precautions to avoid being splashed with hot water.
One word of caution is not to use it in a system with aluminum.
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