Artichoke, either whole or extract is a gentle liver cleanser. I find the extract easier to take. Tumeric is also a great liver cleanser. Take 1 teaspoon in the morning and 1 teaspoon at night - I put it on crackers.
We sell a product that is formulated with both of these ingedients. If you're interested let me know and I can send you information on it.
The grapefruit juice and olive oil cleanse is also effective. Drink 1/4 cup of the olive oil, wait one hour then drink the juice of one grapefruit. Do this in the morning and at night.