Generally, when I walk out my door in the morning for work, I am carrying coffee in my travel mug. I have a short drive to work and enjoy the hot drink on the way and finish it while sitting at my desk. The liner of my travel mug is plastic and we all know how bad plastic is about retaining a food's odor. Coffee is no exception. My mug was so bad that when I had the cleaned mug in my file cabinet and opened the drawer, I could smell it. Even after washing it in hot, soapy water, it still held that terrible stale coffee odor.
This morning, I took a different mug with me and let my regular one soak all day in baking soda water. When I got home, I rinsed it out and took a sniff. No coffee smell. I finished washing it and now know a new way to get the odor out of my cup.