Urine odors in laundry are a common problem in households with young children. Even after a wash cycle completes, the urine odor can sometimes be left behind in the washing machine. To safely remove the odors, use ingredients that will deodorize effectively without damaging your washing machine. This can be done with a couple of low-cost household items that are already on hand in most homes.
Turn on the washing machine and run a regular wash cycle with the water set to "hot."
Let the machine fill up about halfway, and pour 1 qt. white vinegar and 2 cups baking soda into the washing machine.
Let the wash cycle complete, and pour another 2 cups white vinegar into the machine during the rinse cycle.
Examine the washer after the entire cycle completes, and repeat as needed until all urine odor dissipates.