I'll chug warm saltwater if there's no syrup of ipecac available and I've just eaten something poisonous. But honestly, forcing yourself to vomit is probably much more traumatic to the system than just giving it a juice fast for 2 days.
An even better cleanse might be to drink water and eat lots of raw fruit and veges for 2 days. Good roughage, lots of fluid, lots of antioxidants to recharge you.
(and anything you need to clean out is going to be at the "other end" anyway, not up in the stomach)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson