From everything I've read, you've got to drink apple juice every day for 6 days. I've read you can eat apples too.
Some say you can take malic acid, but on one blog, the girl said she did this and was very sick during her liver flush. Someone replied to her that it was because she took malic acid instead of apple juice and it wasn't enough.
You can also drink apple cider vinegar. I'm drinking a tonic recommended by Dr. Axe.
I have read a book on Liver Cleansing flushing I bought on Amazon. It was quite short but now I wish I had bought the Andrea Moritz book just to make sure.
I also read slightly different instructions on Dr. Wilson's site. These are simpler and he says to take just malic acid. After reading what happened to the person I mentioned above, I'm doing the apple juice route.