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For the sake of completeness.
Shop for and read about "NAVAL JELLY'' RUST DISSOLVER, It removes rust from metal
surfaces such as iron and steel. There are a number of brands. I was surprised...

For long term experiment an air lock is a good thing.
Alcohol will build up to a point then the next natural reaction is to vinegar
if you let in any air.

Yes and no... some state and counties have rules that limit you more than
the feds.... Federal rules for brewing/ fermenting permit brewing strangely
enough based on your marital status. 100...