How to get rid of rusty spots on stonewashed blade

I couldn’t find it within the tokopedia search but found using google, “tokopedia bar keeper”

Alternatively order directly from amazon or hargadunia.
 
Citric acid will attack rust (iron). It did a good job on a rusty railroad spike I tried. Citric acid is also used to passivate stainless steel to reduce corrosion. I have some powder (used in cooking and canning), but full-strength lemon or lime juice works. Also good to brighten tarnished brass.
 
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