Brands like Herbal Clean Qcarbo and Detoxify Mega Clean are formulated for rapid detoxification.
If you're looking for convenience, these products are available through major retailers:
Subscription or one-time kits from Little West or Arden's Garden provide cold-pressed juices designed for 1-day to 7-day resets.
Tea kits are a common "gentle" alternative to liquid cleanses: Juice Cleanse Programs - Arden's Garden