Blot the stain with cold water
Apply lemon juice and salt
Let it sit in direct sunlight
Rinse with cold water
Repeat if needed
Use white vinegar on the stain
Gently rub with a soft brush
Wash with laundry detergent
Check the stain before drying
Use a rust remover made for fabric if needed
Follow the garment care label
Test any treatment on a hidden area first