First of all, the use of pressure cooker is after the flame should not be too large, otherwise it will barbecue pot wall, and stick to the wall of the pot when the food will be dry burned to the formation of black traces of carbonization, the correct use of the practice is to adjust the flame to the bottom of the pot with the big or slightly less than the heating to be limited to the exhaust valve to change to a small fire constant pressure (manuals are available). The bottom of the pot and the pot if the color dye can be to the supermarket to buy stainless steel cleaning powder, with a soft cloth dipped to wipe can be removed, but do not use steel wool and other things to scrub