Article: Give the mattress a liberal dusting of baking soda, especially if it has not been cleaned in awhile or has a strong smell. Cover the entire surface of the mattress with an even layer of baking soda. If there is a particular area that has a strong smell, sprinkle more baking soda on it to neutralize it. Moving the mattress next to a window that gets direct sunlight is ideal, as the heat from the sun can help the baking soda work more effectively. If you really want the baking soda to kick into high gear, you can place the mattress outside in direct sunlight. Make sure there is no rain the forecast so the mattress does not get wet overnight. Give the baking soda time to settle in and do its job. Keep others away from the bed so it is not disturbed. Make arrangements to sleep elsewhere for the night so the baking soda can sit.

What is a summary?
Sprinkle 1-3 cups (208-624 g) of baking soda on the mattress. Put the mattress in direct sunlight. Let the baking soda sit for 24 hours.