Bake Your Baking Soda to Make Homemade Washing Soda Since we’re on the topic of unsafe laundry detergent, here’s yet another model of how easy household products are to make. Check out this recipe for washing soda: spread 2 or 3 cups of baking soda in a baking sheet or pan; bake at 450°F for an hour, stirring once or twice. When it sits at 400°F long enough, your baking soda will turn into grainier washing soda. Washing soda gives your detergent extra strength against grease and stains, whether you use a conventional detergent or a homemade one. Thanks to Mommypotamus for the recipe. Posted by → January 23, 2015 at 3:50 PM under News and Events