Lemon juice and maple syrup cleanse; is it worth it?

If you have any experiences with cleanses or know of something else I could try, or just want to talk about it that's great! I've been wanting to do a diet cleanse for a while mostly to cleanse out my GI tract. While the benefits are certainly there, I just want to know if it's inadvisable to do it without the cutting back or if it's essential. General stuff if needed: age 18, moderate (2-4 days) of exercise a week, relatively healthy diet (with a little more grains than I should be having) and I weigh 150 ish pounds, 5ft 5.75 inches.