If the smell doesn't leave on its on, try using some of that oust air odor eater's spray, or that lysol air sanitizer. Last year at school my locker partner left a bagged lunch in the bottom of our locker and it stayed there untouched for a good couple of months. I finally got him to move it but the rancid smell stayed. I sprayed some of that lysol air sanitzer shit and it finally went away.