Modified Colonoscopy Prep for Active Crohn's?

[REP]

I'm not doing what I'm always warning others against and asking for medical advice, but I know there are some people with IBD here who might remember what the modified prep is for colonoscopy. I have one coming up on the 11th, and without getting to specific, the normal prep would probably turn me inside out but I can't remember the modified prep to ask my doctor if I can do that instead! Is it half the amount of Liquid Plumber but the same diet? Any help appreciated so I can call my doctor for medical advice!