How do I kill mildew smell in a cooler with baking soda and vinegar?

Wash the cooler with warm water and dish soap, scrub all surfaces, rinse, then apply a baking soda paste for 15–20 minutes, scrub again, and rinse. Follow with a 50/50 white vinegar and water mix, let sit 10 minutes, rinse thoroughly, and air dry completely with the lid and drain open for 24 hours. If the smell lingers, use a diluted bleach solution (1 tablespoon per gallon of water) but rinse multiple times to avoid discoloration and chemical smell.