Each state has a procedure for removing a lien from a vehicle.
In Wisconsin, see the Wisconsin Dept. of Motor Vehicles page Removing the lien from a title page to see the three means in which you can remove a lien in that state.
Again, each state has slightly different rules, but all Dept. of Motor Vehicles have procedures in place for removing a lien from a vehicle.
Alternatively, you may be able to obtain what some states call a "bonded title" for vehicle the creditor has abandoned. I urge you to consult with an attorney before undertaking this procedure. Wisconsin does not offer this procedure. However, Texas offers a bonded title procedure.
Consult with your state's Dept. of Motor Vehicles to learn if your state offers a bonded title, or the correct procedure to follow when attempting to register an abandoned vehicle.
I hope this information helps you Find. Learn & Save.