They have kits at your autoparts store, theyre like 14 dollars. You just plug in a T connector, then to that a garden hose, turn on your heater and run the water. The junk will flow out of a funnel you plug in to the radiator. Super easy, acceptably effective.
Not a bad idea to replace your t stat and water pump gaskets next depending on how long its been since your coolant system has gotten attention... unless you dont have any leaks... which would mean either you just did this anyway or you jeep is made of magic.