Dust top of cake with a light sprinkle of powdered sugar, if you prefer.
Lay a clean, dry flour sack towel over the cake. Grab both ends of the towel covered sheet (holding the towel too) and flip over so the top of the cake is now resting on the towel. Lift off pan and wax paper.
Spread the ice cream evenly across the cake. Lift one end of the towel to help get the roll started and repeat until all rolled up. Wrap in aluminum foil and freeze until ready to serve.