First let me just say that I can't categorically recommend the Master-Cleanse because I don't know much about kidney damage but I will tell you that the Master-Cleanse is considered a kidney cleanse.
If you do decide to try the Master-Cleanse definetly read the book as there is a section outlining the procedure of substituting the Maple syrup with Blacstrap molasses for diabetics.
It would probably be a good idea to start a precleasne diet of mostly raw foods and veggie juices anywhere from a week to a month befroe doing the MC to get the system to gradually start detoxing before trying the MC. Also drink 1/2 oz of water for every pound of bodyweight daily.