"Clean Language is a communications methodology, developed by David J Grove, a New Zealand 'Counselling Psychologist', during the 1980s and 1990s.
While initially used in clinical therapy, Clean Language offers helpful techniques to all professional communicators, especially those working closely with others.
Clean Language techniques are aligned closely with modern 'enabling' principles of empathy, and understanding, as opposed to traditional 'manipulative' (conscious or unconscious) methods of influence and persuasion and the projection of self-interest.
Clean Language helps people to convey their own meaning, free of emotional or other distracting interpretation from others.
As such Clean Language promotes better clarity of communications, neutrality and objectivity (absence of emotional 'spin', bias and prejudice), ease of understanding, and cooperative productive relationships." (https://www.businessballs.com/communication-skills/clean-language-david-grove-questioning-method/?/)