What can we do on a car stored as a favor for years if the owner just gives vague excuses and promises to pick it up?

We have stored a junk car (unfixed and without an engine) for a friend of my father in law for many, many years as a favor. My father in law has passed away years ago and the car is still with us. For a while we didn't have contact information for the owner and after locating him on the internet about two years ago we left messages for him to pick up his car. We spoke with him and explained the situation on various occasions every time he either didn't have time to talk to uttered something along the lines of vague excuses and promises that he will pick up his junk. Of course nothing happened. We are unable to store his garbage car any longer; it is an eyesore, and a huge inconvenience for our family. In addition, we have been warned by the community association that we will be penalized for the junk car parked in front of our home. I would like to tell him that if he doesn't get the car until Monday (1/20) the junk car is going to be on an impound lot where he will be paying not only for impound fees, but for storage and a lien sale as well. We are at wits end please advice. Thank you!