The reason I suggested a garlic enema, is because I have experienced quick relief of liver movement, and evidence of it working in the stool. If I do them at night, I wake clear headed, and bloat is gone. Sometimes I don't retain for very long, I just run through a few times (I have a gallon bucket)
I understand your fear, it seems harsh, but it's really not, I'm just a little thing and have never had an issue.
You can do a search on curezone or google for information on preparing a garlic enema. I do mine differently. I use a garlic press, and press several cloves into a large bowl I can cover, I dig out the skins and all to get the most out of it. Then I heat water to below boiling so it does not cook the garlic, then fill the bowl and cover and let steep. I let mine steep all day, then strain the garlic water into the warm water and fill the bag.