Apply in this order:

10% Bleach solution. Apply as directed by "Doc".
Box of Baking soda & water. Let soak overnight. Rinse.
Lemon Oven Cleaner. Rinse.
Large can of Folgers. Let sit overnight.
Lemon Joy & water.

If all that doesn't work, either apply Ultrabite liberaly & enjoy a different stink or buy a new cooler cause ain't nothin' goin' ta work!