Question on flushing cooling system

[Chevy nutcase]

Originally Posted by 1970cstblazer

The normal parts store flushes can break up deposits that regular garden hose flushing will not get. If you really have a neglected system, muriatic acid will clean the heck out of the jackets, but are tough on core plugs and anything that is the least bit weakened by corrosion and age. Also stinks and can be harmful to skin.

Using parts store flush is fine and can be done multiple times for bad build up. I wouldn't use Muratic acid for any reason as it destroys aluminum rapidly and any benefit is heavily outweighed by the damage it'd do