Fresh Coffee Stains
Rinse the coffee stain under cold water on both sides of the shirt.
Blot the coffee stain from the shirt using a clean, soft cloth or a heavyweight paper towel.
Gently dab the other side of the shirt with another clean, soft cloth.
Apply a mild dish detergent to the coffee stain and rub it into the shirt gently, using your fingers.
Treat the stain using a pre-wash stain remover and launder as soon as possible. Let the shirt air dry.
Old Coffee Stains
Mix together 1 tsp. of white vinegar and 1 quart of cold water.
Sponge the mixture onto the coffee-stained shirt and wipe clean.
Alternatively, sprinkle baking soda onto the shirt and rub with a damp cloth. Wipe clean or rinse.
Launder as usual and let air dry.