Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to clean a popcorn machine [title] Cool the unit. [step] Before cleaning, allow the unit to cool entirely with all components in place. The unit should be allowed to cool on its own.

Ending1: If it is too hot to allow it to cool completely, the sooner it is washed, the better. [title] Vacuum the tops of the popcorn machine with a corn colander. Ending2: [substeps] Cooling should take between 30 and 60 minutes. Hot temperatures can cause broken popcorn machine bulbs to burst and splinter. Ending3: Do not introduce water or other agents to help cool the machine. [substeps] Unplug the machine while allowing it to cool. Ending4: [title] Inspect the unit for holes or defects. [step] As a food or drug store employee, you may be required to inspect your appliance for leaks, contamination, and other health issues.

Answer format: ending1/ending2/ending3/ending4