What can I do to cleanse my liver?

I've done a lot of heavy drinking over the past few years but I want to start fresh now and rejuvenate my body. Is there a cleanse or detox on I can drink that will help improve my liver? I don't care if its an over the counter product or a concoction I can make. Also, are there any foods or drinks that improve the liver? Please give as much info and suggestions that you can. THANKS