Posted by Chris Case [172.70.206.169] on Sunday, March 12, 2023 at 21:32:38 :
In Reply to: Re: black rust posted by Vaughn [172.71.154.25] on Sunday, March 12, 2023 at 21:21:07 :
aka Phosphoric acid.It dissolves the rust and leaves a phosphate coating. All the paint stores have it. Also used in dairies to dissolve "milk stone". Much more concentrated for dairies.
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