Pour boiling water over the chicken parts to get rid of the odor. Place the chicken, kelp, water, and salt in a Donabe pot or deep soup pot over high heat. When nearly boiling, discard the kelp, turn heat down to a simmer, and cook, covered, for about 20 minutes. Skim off any scum. Remove the chicken to a bowl with a little stock to keep it moist; strain the rest of the stock and, if you prefer, let cool to room temperature and skim off excess fat.