Auto polishing compound on brass?

[EJN]

I used to use Kodak glacial acetic acid (99%) for mixing stop bath when I used to do my own darkroom work. If you inadvertently take too deep a breath close to it, the fumes will leave you gasping for air and your eyes will water like Niagara Falls.

[OldEastRR]

No doubt. And the vinegar shipped in RR cars is probably a high concentration, so if one spills it's not a case of "oh it's only vinegar."

[MK]

I was at an Ace Hardware this morning and walked past the Cleaning isle.  They had 30% vinegar in gallon size.  Marked as "Concentrate" on the jug.