Yamaha provides 3 alternatives — with a flush bag, muffs, or hose-port connector and claims all three procedures function equally well. Bag and Muffs: Engine needs to be vertical, run no more than 800-900 rpm in neutral for 15 minutes with the prop removed. Located in Columbus, Ohio, Andrew O'Hara https://www.linkedin.com/posts/anhometech_anhome-airpod-cleaner-kit-cleaning-tool-3-activity-7180579811667374080-EjnJ?utm_source=share&utm_medium=member_desktop