A great resource for cleansing is Dr. Alejandro Junger’s book, Clean: The Revolutionary Program to Restore the Body’s Natural Ability to Heal Itself. His book is quite readable and interesting. The three week cleanse he suggests is reasonably easy to follow. He recommends eating two liquid meals and one solid meal each day. Depending on the weather, your activity level and your constitution, you may want to try one liquid and two solid meals. That’s what I am doing this year.
Dr Junger also has another book called Clean Gut: The Breakthrough Plan for Eliminateing the Root Cause of Disease and Revolutionalizing your Health
I have done many cleanses over the years and this is the one I go back to. My Nourishing Winter Cleanse is quite similar to this, so if you want to understand more of the science behind our health and food, this is a great read.