A nurse is providing discharge teaching to a client who has an impaired immune system due to chemotherapy. Which of the following information should the nurse include in the teaching?

"Change the water in your drinking glass every 4 hours."

"Wash your toothbrush in the dishwasher once each month."

"Change your pet's litter box daily."

"Wash your perineal area two times each day with antimicrobial soap.”