We do a soup broth/juice fast when we get glutened.
The first fast we ever did started us on our gf journey. It was 4 days and on the fourth day, I felt super-human!
I don't have the wear-with-all to do it very often (especially now since I'm nursing and almost always ravenous) but I do want to do another one soon because I have come to believe that it gives the body a break and gives it a really good cleanout (like cleaning out your oil/filter in your vehicle

).
My son (6 years old) does two day fasts (broth/juice) frequently (about once every 2/3 months or so) because he gets contaminated very easily. Nothing gets his system back on track as quickly and efficiently as one of these fasts (and we've tried many things over the last 4 years).