Summarize the following:
If your pillow is covered with a slipcover or pillowcase, take the protective covering off. Check the care instructions on the tag of the cover, and wash the cover or pillowcase in the washing machine or by hand according to the instructions. Remember to wash your pillowcase and slipcover every 2 weeks at least to keep your pillow smelling fresh. Baking soda is a great deodorizer and can be used to freshen up a variety of surfaces, including gel and memory foam. Coat the entire pillow in a layer of baking soda, working on one side of the pillow at a time. If you have a very large or European-style pillow, you may need to use 3-4 tablespoons (43.2-57.6 grams) to cover the surface. Let the pillow sit while the baking soda absorbs the odors off of the surface of the gel pillow. If possible, let the baking soda sit on the pillow overnight.  If the pillow has a very bad smell, try placing it in a large plastic bag with the baking soda on it for 1-2 days. The baking soda will have time to absorb the odors from the pillow. If you have children or pets, place the pillow in a place where they can't access it, like on top of a cabinet or in the closet. After the baking soda has absorbed the smell from the pillow, vacuum the surface thoroughly. Working in sections, pull the brush across the pillow to make sure all of the baking soda is removed.  Make sure to clean and dry the vacuum attachment before using it on your pillow. It might take a few passes of the vacuum to remove all of the baking soda. After the first pass, run your hand across the pillow. If it still feels grainy, vacuum it again.

Summary:
Remove the cover from your pillow. Sprinkle 2 tablespoons (28.8 grams) of baking soda over the pillow. Let the baking soda sit on the pillow for 30 minutes. Use the brush attachment of a vacuum to remove the baking soda.