She basically sprinkles baking soda all over the mattress to clean it and deodorize it. All you need to do is to spray 200g of baking soda and leave it for about half an hour before you vacuum the mattress.
Not only this will clean your mattress and make your bed environment healthier, but it also leaves a wonderful scent. It is recommended that you vacuum your mattress before and after cleaning it with baking soda. In this video, Melisa Maker will show you how she cleans her mattress