Can you jog my memory, please?
"steamer" wrote in message
...
--Probably muriatic acid. Be very careful with this stuff; it
The grocery store version is "Sno-Bol" toilet bowl cleaner. It contains
about 10% HCl with mostly water and detergents for the rest.
It's quite corrosive enough to both remove the zinc, and pickle the steel
prior to brazing.
LLoyd
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