It seems to me that washing dishes with soap serves two purposes:
- To remove food residue from the dishes
- To kill bacteria that got on the dishes
As far as I know, the primary way bacteria get on dishes is from coming in contact with human saliva. But that wouldn't happen with dishes that are used exclusively for preparing food and not for eating it. So, assuming good residue can be removed without soap, is there any benefit to washing dishes used for preparing food with soap?
For the purposes of this question, assume we are talking about a home kitchen and not a restaurant.