What to use to clean this carb?

MerlinsMopar said

Does that work good? I think some kind of acid is used at the lawn mower shops for water corrosion. It may not be pitted inside. Maybe muratic acid?

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Nitric acid is the best aluminum cleaner but is very dangerous, don't get it on you ! muriatic acid is more for concrete but will work on aluminum. Hydro fluorohidric mixed with phosphoric is what they use to clean aluminum truck trailers.