I have found that grapefruit juice works well. Have used OJ and Apple juice and Lemon juice either alone or in combinations. They worked also, although pure Lemon juice was a bit too acid.
Have tried other oils, but with no significant change in outcome.
Using The Clark Flush with little change. Have tried more oil...not much benifit.
Have found that eating a light non-fat breakfast does just as well as fasting. Hydrate well before noon on the day of the flush. Start rehydrating after noon on the day after the flush.
Agree with the previous writer who said that the longer you wait to eat on the day after the flush, the longer the stones keep coming.
Have found that I can be assured of a better clean-out if I take a healthy dose of laxatives on the evening before the flush. Does not hurt the flush and may help a little.
I add 10 drops of 3x Oregano oil, 10 drops of tripple distilled eucalyptus oil (V-Vax) and 10 drops of grapefruit seed extract either in place of the green walnut extract or in addition to the walnut extract.
So far, I have not come to the end of the stones! Have been doing for 4+ years and have done somewhere around 175 flushes. Pretty routine now. Flush anywhere from every few days to about 2 weeks depending. Have come to the conclusion that the liver is producing the little SOB's about as fast as I can flush them out. Sizes range from chaffe to 2.5 cm. Many thousands have been flushed.
Have tried various things to improve/modify/reduce fatty acid (cholesterol) storage in the liver. So far, no big improvements. Many things yet to try. Keep on keeping on!