My dad told us we need to wash tuna cans before opening them because canned food (at least tuna) is imported on ships and rats really like to "take a trip" on these ships, too. They touch those cans and thus contaminate them.
Do I really need to wash the tuna can with soap before opening it?
I feel like it is closed very tightly but, maybe for the sake of the smallest chance the tuna will touch the can.
I mean, he is not wrong with the rats on ships part, and it is also logical, and if not then for the sake of the smallest chance that arat got on board.