Many people go to the restaurant to eat every day, so will the food in the restaurant be cleaned in time?

Your relatives are right. Eggplants and peppers in restaurants and hotels are basically not washed, because they will rot and the meat will not be washed, so the hotel's food will taste bad, so try not to eat in this big restaurant, and the same is true in small restaurants. When there is a large flow of people, it is basically unsanitary not to suck or wash.