engine/ radiator flush whats the best

[az1966]

gotta replace 2 year old radiator,, when I pulled the head to rebuild it ,,,the block looked like it had to much rust,,I've seen/heard/read that OXALIC acid is the chem to use and then flush with baking soda to neutralize it.....problem is I can;t find it so what would be the runner up for a solid engine flush? as usaul any info helps .. thanks

 

[addo]

Oxalic acid can also be very poisonous.

Regular hydrochloric acid is cheap and will eat rust nicely. Even straight ethanoic acid (vinegar) will do the job.

Remember add water, THEN acid! Work prepared for a disaster. Wear chemical proof gloves, goggles and have a large pail of fresh water barely a yard away for emergencies.

 

[wallaka]

Muriatic acid works well. It's for swimming pool cleaning, most any hardware store will carry it.

 

[JackFish]

I tried vinegar and water on some rusty stuff, like a heat riser, and the results were impressive.