Foul odor from back area of fridge/Kenmore bottom freezer

I had the same problem, but just fixed it. I have a maytag bottom freezer and when the fan blower comes on, there was a foul/stale smell that permeated the kitchen. There is no drip pan that I could remove to clean.

I just removed four screws from the back cover of the fan blower area, reached in with a small cup of organic odor remover and poured it into the drip pan just under the fan blower.

Any odor remover would work. probably vinegar or enzyme odor remover would work, too.

I now have fresh smell when the fan blower comes on.