Cleaning is not necessary. If I think, then cleaning is necessary. You were practicing with Jack. Jack is a very good teacher. That is wonderful.
Clear mind means intuition mind.
If you keep this mind always, moment to moment, you can understand your correct opinion, your condition, and your situation. Correct moment to moment action is your correct opinion, correct condition, correct situation. So don't check anything. Only go straight - Kwan Seum. But words are very important.