How to Launder With Baking Soda ~ An effective cleaner, deodorizer, and fabric softener, baking soda in a paste (mix 4 tablespoons baking soda and an equal amount of water), when applied to stains, can absorb odors and help break down grease. Presoak new clothes (1/4 cup baking soda to 1 gallon water) to eliminate factory residue.