Shampoo Sliding off Polypropylene (IMAGE) Ohio State University Caption Engineers at The Ohio State University have invented a coating to help soap pour out of plastic bottles more easily. Here, a drop of shampoo slides off a piece of polypropylene. Credit Image from a video by Philip S. Brown, courtesy of The Ohio State University. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.