Brian B

I was just in Pep Boys to pick up coolant to put in the shark. (Dex-Cool orange stuff) and I saw Prestone and Zerex make Radiator Flush ($3.50) and Radiator Cleaner($5.50). Anybody know the difference between the 2 (besides 2 bucks)? Is this stuff safe to use in our cars?

I want to clean out all of the gunk that's probably in there, but I don't want to hurt anything doing it...

Thanks,
Brian