In that question, "You know" is simply introductory. It has no real meaning ... or else it's introducing a question that the question-asker thinks the other person will agree with.
I'd omit it.
You know, trash can be useful.
- What do you mean?
(What is the meaning or use of 'You know'? When do we use? What other expressions can we use instead of 'You know'?)
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