This one is easy! The interviewer simply wants to know what janitorial work you have done. This will give the interviewer a better idea of what type of training you will need if you are hired. Have you emptied trash cans, mopped hallways, vacuumed, set up chairs and tables for events, cleaned up after sickness, dusted, re-stocked paper supplies, or cleaned toilets? Now is the time to share everything you have experience with!