How to grip a lubed tube: Check out my image album, "Deep Cleaning" in Enemas>Enema Fun. See https://www.zity.biz/index.php?mx=gallery;ox=showalbum;ax=7400 .
When I use my 1-inch diameter tube with Vaseline, I don't have any grip issues. I do lose my grip sometimes with mineral oil, olive oil, or water soluble (polypropylene glycol based) lubes. With Vaseline this morning, As Buttwomen does, I have learned to enjoy (thanks to her), inserting my tube all the way in before I open the valve. I love the sensation of hot water surging into the bottom of my ascending colon!
How to clean out before using a colon tube: I clean out with two or three fills with a gallon bag and a thorough expulsion after each fill. I use a soft, 3-inch diameter Silicon Nozzles retention-plug nozzle that seals superbly and won't pop out. See https://www.zity.biz/index.php?mx=gallery;ox=showalbum;ax=7719 for images. If I can endure the discomfort of the first two quarts, I can get a whole gallon bag inside me on the first shot. To thoroughly expel a gallon enema, I use a combination of: (1) body positioning, (alternately on back in my tub, on my left side, and standing); (2) abdominal massage with my hands, particularly over my ascending and transverse colon; and (3) external abdominal pressure with a 10 lb glass wine jug filled with water. After 2 or 3 gallon bags with thorough expulsions, I feel empty, my waistline is 2-4 inches reduced from what it was pre-enema, and I feel like I can very nearly press my naval into my spine. I love that clean, empty feeling. Any additional enemas expel almost completely clear, and I'm ready for clean ass play, or to insert my colon tube all the way into me.
Is clean out necessary before using a colon tube?: No. I sometimes use a colon tube to do my clean out. This is messy, so I only do it in a bathtub. I lie on my left side, right knee to my chest, I lube the tube and my butt, and I work the tube as far in as I can with water running half speed before I pull the tube out and expel. The I use my shower shot to, clean me, the tube and the tub, I re-lube my butt and the tube, and I work the tube in deeper with water running slowly. I usually need 3 or 4 partial insertions before being to insert the tube the entire length of my colon.