I was having dinner with a coworker once, (first time over their house) and she served salad for dinner. After the first bite tasted a little bit weird, almost a little bit chemically. I asked her if the lettuce was washed; she told me “yes I always wash the lettuce with soap and water.” Oh. The chemical taste was actually just leftover dish soap. She claimed hers tasted fine, but felt terrible told me I was more than welcome to rinse it some more in the sink. I was polite, and finished my meal and thanked her, though for the remainder of the meal it was impossible to get that initial taste out of my mouth. She felt super bad about the whole thing. I still sometimes come over for dinner but she never makes salad.