They asked this question to judge your level of patience. "I do not get annoyed with this. This is something that has happened multiple times with me in the past. It's understandable that they did it by mistake, so I will clean it again in the specific dirty areas."

Note: Make sure to answer this question very calmly with the standard facial expressions. In Janitor interview questions, this question is asked to you where you will be judged not only on your answers but also with your facial expressions.

BY Best Interview Question ON 30 Jul 2020