Clean language aims to support clients in discovering and developing their own symbols and metaphors, rather than the therapist/coach/interviewer suggesting or contributing their own framing of a topic. wikipedia 
YOUTUBE aVvcU5gG4KU Published Feb 11, 2012.
Caitlin Walker has systematically tested and developed her ideas in challenging arenas and her robust ideas have become a sought after product. linkedin
Clean Learning is a world class provider of training in Clean Language, Clean Space, Symbolic Modelling and Systemic Modelling. site
.
We have stumbled upon questions that lean toward "clean". I think my approach is basically "tell me something that you know, I don't, and others might find interesting."
Reporting experience: "It sounds like you've had a pretty successful project. What did you learn that you didn't expect to learn?"
Sharing expertise: "You solve a lot of problems here at work. What is something you regularly do that you are surprised others don't do?"
Linking to found content: "What does a site say about itself that can help me know if I want to click this link?"