As an acid it will keep on eating untill neutralized by being Flushed Away with water or neutralized with a base.
Washing soda and baking soda are a base. Either will work but washing soda is better I think.
Washing soda is Na2CO3 or Sodium Carbonate while baking soda is Sodium Bicarbonate or NaHCO3. Both can be synthetically produced by the Solvay process. ... Washing soda is caustic and should not be consumed, inhaled or applied to the skin. In terms of texture, baking soda is white and fine while washing soda is coarse.
