Turn the Henny Penny fryer "Off" and verify that the filter drain pan is set below the drain valve. Note that if the filter drain pan is not in place, hot oil may splash and result in the possibility of burns.
Pull the drain valve knob out slowly to remove hot shortening from the cookpot. Close the drain valve and discard the shortening. Slide the empty filter pan under the fryer.
Lower the lid to the lid stop and move the lid back. Fill the cookpot with hot water to the fill indicator. Add approximately 8 ounces of fryer cleaner to the water and mix completely. Set the fryer to "Boil."
Scrub inside the cookpot and around the top of the fryer and the lid. Turn down the temperature if the cleaning solution begins to foam.
Turn the main power to "On" and open the drain valve. Drain out the cleaning solution and discard.
Close the drain valve and refill the cookpot with hot water to the fill mark. Add 16 ounces of distilled vinegar and set the cookpot to "Boil." Use a clean brush to scrub the inside of the cookpot and the lid liner.
Drain the vinegar water and discard. Rinse the cookpot with clean, hot water and then dry thoroughly. Refill the fryer with fresh shortening.