Phosphoric acid eats tooth enamel...

https://www.google.com/search?q=redu...obile&ie=UTF-8

I use vinegar on knife blades esp SS. Place blade in cup vinegar overnight rust blackness ...rub out wth crumpled aluminum foil.

Auto parts n various rusty steel surfaces HD n Wal have a convenient white bottle. Several apps between using a carbide grinding bit will remove rust from pits. Phosphor loosens rust from steel, softens it.

Never tried phosphor on white ionic exchange compounds. Any experience on that ?