Cleaning out water jackets, with block outside car.

I wouldn’t use anything oily inside the cooling system, as it will coat the entire system possibly causing a loss of heat transfer.

Also, I have used muriatic acid on things before but it’s very dangerous and the fumes can kill you.
I would only use it if I could stay completely away from it while it cooked.

White vinegar is fine, just takes longer, but safe.
I would give a block a couple of days soak, then rinse with water.
Vinegar it is! Hopefully my puppy doesn’t get annoyed!

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