Thank you for your video on periodically cleaning washer. It is very informative and educational. You're correct that the solubility of baking soda in water are low (6.9 g/100 ml @ 0 C to 23.6 g/100 ml @ 100 C). Baking soda is used as mild abrasive for cleaning and reduce odors. people needs to careful about mixing chemicals (DIY) at home.