Crude salt diet crude salt has the function of sweating, it can discharge waste and excess water in the body, promote skin metabolism, soften dirt, supplement salt and minerals, and make skin delicate and firm. Method 1: Buy several bags of raw salt in the supermarket or grocery store. Before each bath, take a cup of coarse salt and add a little hot water to make a paste, and then apply it to your upper arm. /kloc-after 0/0 minutes, wash off the coarse salt with hot water, or wash it off after massage, and you can start taking a bath. Method 2: After taking a bath, sprinkle a tablespoon of coarse salt on your palm and massage your upper arm directly. Don't rub it too hard, so as not to make your skin rougher. If your skin is sensitive, use a thin bath salt.