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Originally Posted by
jeepsr4ever
Sodium carbonate (washing soda/Arm and Hammer)
Pros
Available commercially as washing soda
good rust inhibitor
Cons
Will leave white residue
Steel YES
Aluminum YES
Stainless YES
Brass YES
Sodium Nitrite (sold as food grade or non food grade, available on ebay in bulk)
Pros
Very good rust inhibitor (less is requires per gallon than sodium carbonate)
Available commercially as sodium nitrite (also a meat preservative and found in deli meats)
Cons
Is not compatible with aluminum and can create dangerous human carcinogenic nitrosamines (especially in high concentrations)
Steel YES
Aluminum (No, aluminum creates aluminum oxide and turns water acidic that is not safe for sodium nitrite)
Stainless YES
Brass YES