Since baking soda absorbs oil, anything that has an oily residue, such as a salad dressing cruet, can easily be cleaned by shaking a bit of baking soda inside, then rinsing with warm water.
Plastic, silicone, and rubber kitchen utensils are easily stained. To remove these marks, make a baking soda paste and apply it to the stained areas using a scouring pad, sponge, or rag. Similarly, if you have stained plastic food containers for storing leftovers, use the same method. You can make the baking soda paste out of water or lemon juice, which will add a clean, fresh scent.
If you have a thermos or lunchbox that is beginning to smell a little funky, pour 1/4 cup salt into it and close it up for the night. In the morning, rinse and wipe clean, and it should smell fresh again.