1, cut the grapes with scissors, don't completely remove the stems and leave a little, or simply cut them into small strings.

2. Gently put the cut grapes into the basin, first rinse the dirt and impurities attached to the surface of the grapes with clean water, then add baking soda, flour and salt, stir to make them fully dissolve in water, and then let the grapes soak in water 10 minute.

3. Stir clockwise to remove impurities, then remove the grapes from the clear water and put them in a perforated container to control the water clean.