Dutch - I've been very happy with the way that Wipe-Out cleans, but have had a dickens of a time keeping it in the barrel where it belongs. When I tried poking my pinkie in the chamber to try and tell when the foam had reached that point (as well as keeping it from going past that point) I felt that by plugging that end, I was trapping air and making it back up even worse at the muzzle. Have you experienced that with the ear plugs? They sound like a good idea, but I wondered about that part of it. Also, have you found a way to keep it from backing out as you squirt it into the barrel? Thanks.
