I also have a friend who swears by these. I've had a big ol' box of them that I bought after her recommendation. The box has been in storage for about three years though, and I've yet to use them. Supposedly you can re-use them many times, which is economical. But if the issue you're having is common, I'm not sure I want to go there!
Following along, and I hope you get some help from another GCM. If not, I'm happy to FB message my friend if you'd like.