1. Preheat the oven to 350 degrees Fahrenheit.
  2. Place the granite composite sink in the oven and bake for 10 minutes.
  3. Remove from the oven and let cool for a few minutes.
  4. Pour a layer of baking soda over the top of the granite composite sink and spread evenly across the surface.
  5. Pour a layer of vinegar over the baking soda and vinegar mixture, spreading evenly across the surface. Let sit for 5 minutes to react before using as needed.