This method is not very environmentally friendly but it is particularly effective: remove the rust spot with a cloth soaked in hydrochloric acid. You can also try with ether or burning alcohol (pay attention to your hands and eyes because these solutions are quite corrosive).
3 – AGAINST GLASS
Choose an oven stripper product to remove traces of rust on a window; just follow the product instructions.
4 – AGAINST ROUILLE ON TOOLS
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