1936 LB engine block internal scale clean

[Blastfromthepast]

Has anyone ever used an internal block cleaner.
I need to remove rust scale form the heads and block
Without opening up the engine. Any suggestions? Blast.

[Aarongriffey]

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CLR.
Calcium,lime, rust.
Get it at a hardware or building supply store.
Mix it with water. It’s for flushing water pipes.
Leave it in Half hour.
There’s also a product by RustOleum called rust dissolver.
I got mine at Auto Zone. About $20 a gallon.