Final answer:
If a janitor's hands are irritated by cleaning, they should wear gloves, use gentle cleaning products, and wash their hands thoroughly.
Step-by-step explanation:
If the janitor's hands are irritated by cleaning, they should take some steps to protect their skin and prevent further irritation. Firstly, they can try wearing gloves while cleaning to create a barrier between their skin and the cleaning chemicals. Secondly, they should use mild, non-irritating cleaning products that are specially formulated for sensitive skin. Finally, after cleaning, they should wash their hands thoroughly with soap and warm water to remove any residual chemicals.