1. Finally, why is washing soda a good choice for things this? 2. After the soldering it should be washed off with water and washing soda . 3. The solution, they say, is to add sodium carbonate, also known as washing soda . 4. Washing soda is an effective heavy-duty cleaning alternative to solvents.5. The result is an emulsion of oil in water, stabilized somewhat by the washing soda . 6. :For really soiled stuff like diapers, Grandma used simple washing soda and borax followed by vinegar. 7. Second choice : Washing soda or trisodium phosphate ( available at grocery or paint stores ). 8. This process happens continually until the entire stain is removed, or the washing soda is used up. 9. It sounds like a good idea, but for the life of me, I cannot find washing soda . 10. Note : Some modern detergents work at low temperatures but washing soda and borax needs water to be very hot.