Disconnect the Dishwasher if Needed
If you have a dishwasher, it is most likely connected to the garbage disposal. To remove the dishwasher drain hose, squeeze its hose clamp with pliers and shift it off of the hose end. If the clamp has a screw drive, loosen it with a screwdriver and slip off the clamp. Grip the hose by hand, and rotate it back and forth as you pull it off of the disposal nipple.