Scrape off excess mustard with a dull knife or spoon
Rinse the stain from the back with cold water
Apply liquid laundry detergent or dish soap directly to the stain
Gently rub the fabric together or use a soft brush
Let it sit for 5 to 10 minutes
Rinse thoroughly with cold water
Repeat if needed
For stubborn stains, soak in a mixture of cold water and oxygen bleach
Wash the item in the hottest water safe for the fabric
Check the stain before drying
Air-dry until the stain is fully gone
If the stain remains, repeat the treatment before using heat
For non-washable fabrics, blot with cold water and a small amount of mild detergent
For carpet or upholstery, blot with detergent solution and rinse with clean water
Avoid using hot water or a dryer until the stain is removed