Use a butter knife to scrape off the bird dropping over a trashcan or onto a napkin. Remove all of the dropping and dispose of it.
Rinse the stain with cold water to remove residue from the bird dropping.
Spray the stain with an enzymatic pet-stain remover and allow it to sit for 15 minutes.
Wash the clothing with an enzymatic laundry detergent.
Check the stain. If it remains, apply a few drops of hydrogen peroxide followed by a drop or two of ammonia, using an eyedropper, and then launder again with an enzymatic detergent.
Soak the clothing in a solution of 1 quart of water, 1 tablespoon of vinegar and 1/2 teaspoon of enzymatic laundry detergent if the stain remains. Particularly stubborn stains may be due to the bird eating berries.
Rinse the garment in cold water and sponge it with rubbing alcohol to remove any remaining signs of the stain.
Wash and dry the garment as usual once you see no signs of the stain.