Try this one
1. Buy some fresh ground coffee, from where ever you can get some.
2. Dump 1-2 cups of it on a plate and spread it around
3. Place the plate in the unit.
4. Close the unit for about 48 hours.
5. Throw out the coffee and replace with a box of baking soda
(Cut the top of the box completely off the baking soda.)
6. Leave there for about 2 days.
7. Smell your units new fresh and clean coffee smell.
Who doesn't mind a little coffee and cedar smell?