Liver flush prep whilst kidney cleansing!

Does anyone know if its safe to start preparing for a Liver Flush whilst cleansing the kidneys?
Im half way through a 28 day cleanse and plan on doing a flush as soon after as is possible!
I will be using GCG for a week prior to the flush and wondered could i start to take it a week before my kid cleanse is finished so as i can do a flush on the next day.
Any help would be much appreciated
Thanx
Shagley