The smell of sour milk can be removed using baking soda or a commercial deodorizing and sanitizing product. Removing all traces of milk is a necessary step to removing odor.
Clothing can be soaked in cool water with a laundry pretreatment product, oxygen bleach, or, if the clothing can be bleached, chlorine bleach. Fill the washer with cold water, then add the clothing to the washer as soon as possible to remove both the odor and the stain left behind by milk. Housecleaning Central states that clothing that can be bleached can also be treated with lemon juice to remove stains and odors. Squeeze lemon juice onto the affected area and place the clothing in the sun until the lemon juice has dried, then wash as usual to remove odors.
Carpeting requires removing the spilled milk from both the surface of the carpet and the padding. Blot the carpet with cool water and a paper towel, then use a wet vac to remove excess moisture. Housecleaning Central recommends pouring baking soda over the area after blotting. Allow the baking soda to dry on the carpet, then vacuum. Repeat the process as needed to deodorize the carpet.
A solution of 1 tablespoon of chlorine bleach in 1 cup of cool water can be used to remove odor on light-colored carpets only after performing a colorfast test in an inconspicuous area of the room.