Fluted tube cake pans can be a challenge to grease. Try this: Place a dab of shortening on the outside of a small food-storage plastic bag. Slip the bag on your hand and rub shortening on the inside of the pan. Repeat with more shortening until every nook and cranny is greased. Give the inside of the pan a good sprinkling with flour, shake excess from pan, and your baked cake will slip right out!