Ten Percent of People Are Lying About Washing Their Hands 2.06K Max Read 09/14/10 02:03AM Filed to: Lies Lies Hygiene sanitation hand washing Disease Surveys Results A recent "observational study" found that 85 percent of adults washed their hands after doing their business. Not too bad! But not as good as the 96 percent of adults who told phone interviewers that they "always" wash their hands.