Perhaps with a little cold water or soaking if necessary but not always. Definitely no soap, vinegar, bleach, etc. I have a friend who cleans this way and I'd like to properly insult them. Calling them a caveman is too vague. What do we know about when different cleaning methods developed?
What do we know about when different cleaning methods developed?
A few weeks ago this thread was posted asking about how soap came to be. There are a number of responses in there which might be of interest for you, although I'd particularly point to this one by /u/antiquarianism as I think it gets most to what you are acting in particular.