It can be harmful to rub your eyes if you have detergent on your fingers. Detergent tablets contain chemicals that can be very harmful if you by accident get them in your eyes or in your mouth.

Hanna’s parents have instructed her little brother on how to load and unload the dishwasher. He unwraps a detergent tablet and puts it in the dispenser. Afterwards, he washes his hands.

Why does Hanna’s little brother wash his hands?