A food handler was assigned to clean a slicer that was too difficult to move. The slicer was unplugged. Then the removeable parts were taken off the slicer and cleaned and sanitized in a three-compartment sink. Food bits on the slicer were removed. After the machine was wiped down with detergent and water, it was sanitized and allowed to air-dry. Then the food handler put the machine back together. What mistake did the food handler make