What is distiller's grains? Can you whiten it? How to use it and where can I buy it?

I heard in the program that distiller's grains can also whiten, so I deliberately tried it. First, apply ginger slices for about 30 minutes, and then your face will be spicy. After this feeling disappeared, I used distiller's grains as a mask. Distiller's grains are bought in the supermarket, probably around 6 yuan, and the vats have to rot first. My method is to put the distiller's grains in a large-caliber cup and mash them with a bottle cap filled with mineral water. Remember, it is best to use it once a week, because distiller's grains contain alcohol!