Rust Removers, Liquid—Acid

The cleaners may be diluted or used as is. Use acid formula on non-ferrous metals (e.g., aluminum, zinc) at temperatures below 165F in stainless steel tanks. Use alkaline formula on ferrous metals at temperatures above 135F. 

SOURCE Shell Chemical Co. NEODOL Starting Formulations for Cleaning Products Formulas 

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Rust converter" is sometimes a greenish liquid suitable for dipping (in the same sort of acid bath as is used for pickling metal), but it is more often formulated as a gel, commonly called naval jelly. It is sometimes sold under other names, such as "rust remover" or "rust killer". As a thick gel, it may be applied to sloping, vertical, or even overhead surfaces. 

Acid Cleaners are used with extreme caution. Bowl cleaners are generally acidic in nature, and are available in powder, preferred solid block or liquid form. The function of toilet cleaners is to remove effectively fecal soils, lime and rust deposits, and urinary calculus from commodes and urinals. 

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