New research suggests that, despite popular belief, cleaning a surface does not actually leave it spick and span. Hundreds of years ago, soap was made from ashes and animal fat, and rugs and clothing were beaten to death to remove dirt. While the science behind cleaning has clearly come a long way, there is still so much we apparently don’t know. Cleaning products leave a film on the surfaceSince the COVID-19 pandemic, the world has cracked down on cleaning. We wash our hands more and wipe down surfaces more, and yet, new studies suggest that isn’t enough. Reporting in ACS ES&T Air, researcher…