How to clean a dirty engine insides.

[Ed ke6bnl]

My wifes 68 mustangs radiator is getting plugged with rust particles more like peaces.  The life time warranty on the radiator that is leaking at the transmission cooler fitting will be exchanged for free for a new one.  I have made a flushing tool that puts water in the engine and or radiator and then is hit with a blast of compressed air will get rid of a lot of the loose stuff.  BUT is there a good solution to run through the block b4 I change out the rad. that will help clean the insides of the block and then I will put in the new radiator. I have available some condenser cleaning solution for air conditioning coils that has a strong base in. (sodium hydroxide) not sure if I mix it up as for use on ac coils that this would be good??? What have you all had any luck with.

[donsrods]

How about a 50/50 mix of muriatic acid and water?  We do that on marine engines to get rid of scale. Never done it to a car though.

Don

PS: Whatever you use, flush really good afterwards.