Pour it into a can and place the rusty tool such as stuck pliers screwed items etc in it for a day.
Removing oxidation from stainless steel.
Cleaners containing oxalic acid such as bar keepers friend soft cleanser or zud cream cleanser will remove rust.
This is one of the most effective methods to remove stainless steel.
Spray the infected surface with clean water and make sure to wipe it clean with a cloth.
Brush if needed using a brass brush from dollar stores size of a toothbrush.
Read more about corrosion solutions.
Many stains will be lifted from stainless steel by the action of steam vapor.
Rinse the surface with water.
Mix white distilled vinegar with water.
Rinse the larger surface area be it the basin of your sink or a section of your stainless steel counters thoroughly to remove any debris and dampen the surface.
Wait 1 minute then rub it in the direction of the grain.
Pour the coke on.
Grab coke and tin foil step 2.
50 by volume hydrochloric acid will quickly remove the black oxide coating.
Make sure to use the liquid product not the dry one which contains grit that could scratch and damage the stainless steel finish apply the product with a damp sponge.
Get a liter of diesel actual diesel not the fuel additive pictured.
Remove the soaking tool from the can.
See the steps below and the full post here.
The black oxide coating can simply removed by cleaning off any rust preventive present and placing the parts in an acid pickle.
Exposure to high salinity environments such as sea water can remove the native protective layer chromium oxide and allow oxidation corrosion to occur at the substrate.
Remove rust stains from tools with diesel.
If you scratch stainless steel with steel wool or leave it soaking in water for too long you can remove the chromium oxide layer and let in rust.
Although passivation will occur spontaneously in the presence of oxygen it can be enhanced with the use of chemical treatments.
Passivation is the selective oxidation of a stainless steel surface which removes iron and enhances the chromium oxide content of the surface thereby creating a shell against corrosion.