Cotton wool?
Those puffy little balls of cotton you use for medicine etc. U.S. equivalent is ‘cotton balls’. 4.3.7. How to disappear completely and never be found. Coincidentally this is also the title of a book by Doug Richmond about: “Planning for a disappearance, arranging new identification, finding work, establishing credit, pseudocide (creating the impression that you are dead), and more” The book cover can be found here: http://www.amazon.com/covers/0/80/651/559/0806515597.l.