One way to remove rust stains from clothing is to thoroughly saturate the rust stain with mild dish soap and water, then blot the rust away with a clean white cloth. Remove any additional rust stains with a mild mixture of ammonia and water.
- Remove as much rust as possible
Run the clothing under water to remove as much rust as possible, but do not rub the rust with any sort of cloth or brush, as brushing just pushes the rust further into the fibers.
- Make a mix of mild dish soap and water
Mix together 1 cup of warm water and one-quarter teaspoon of mild dish soap. Test the clothing in an inconspicuous place for colorfastness if you are unsure.
- Saturate the rust stain with the dish soap
Dip the rust-stained clothing into the soap mixture, or pour the soap mixture over the stain. Allow the soap to sit for at least 5 minutes.
- Blot the stain to remove the rust
As the rust rises from the cloth, blot gently with a paper towel or white cloth. Rinse in cool water.
- Repeat the saturating and blotting
Repeat the steps of saturating with the mild dish soap mixture and blotting the rust as it rises from the clothing until no more rust comes onto the cloth or paper towel. Rinse thoroughly to remove all the soap.
- Saturate the stain with ammonia and water
If there is still rust present, mix 4 cups of warm water with 2 tablespoons of regular ammonia. Saturate the rust stain with the ammonia mixture.
- Blot the remaining stain with a clean cloth
Blot the spot again with a white cloth or paper towel. Rinse very thoroughly to remove all remaining ammonia.