Scrubbing the hub of an intravenous catheter is important to prevent catheter-related infections. It involves rubbing the hub hard with an alcohol swab for 15 seconds using a twisting motion before and after accessing the catheter. A study at Johns Hopkins found scrubbing for 15 seconds was more effective at decontamination than 5 seconds. The procedure for scrubbing the hub involves hand washing, wearing gloves, using a 70% alcohol swab, scrubbing for 15 seconds with a twisting motion on the stopper top and before any medication or blood is withdrawn, scrubbing again after, and changing the stopper before discarding gloves. Scrubbing the hub helps get rid of contamination and maintain sterility and catheter patency to avoid infections.