The general information I've found says to use Nitric acid at a 30% (by volume) concentration to desmut. However, most agree that plain nitric acid is not enough to completely desmut, thus there are many proprietary mixtures available.
The main problem I see is this: if you don't know the concentration of the acid you have, how will you know how much to dilute it? Wish I could help you more, but that's about all I know. Perhaps you could contact the manufacturer of the acid if their information is still on the box.
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