1998 jeep grand cherokee parasitic draw

If it were a "bad wire", I'd assume you meant a dead short which would be much more likely to blow the fuse than drain the battery. If you still have the dash apart, it wouldn't be hard to disconnect the cluster and lighter to see if the draw still exists, would it? If there's still a draw it must be the rear washer. Else plug in the cluster or lighter and see if the draw appears. I'll take the cluster for 50¢, Alex.

The draw may be isolated to one of these individual components. First unplug the rear windshield washer motor and see if draw goes away. If not plug it back in and repeat with the other 2 components. If unplugging one of these components eliminates the excessive draw you have found the faulty component. If not then you may have a short somewhere. But a component check is a good place to start.