It’s a tough situation mate and I suppose you’re going to have to play the bad guy at one point of time and show them that you mean business by moving everything out of the way. Reading what you’ve posted I’m sure you’ve already done the “FINAL NOTICE” letter? It’s just time to man up and actually get down to the dirty job of the removal of everything now… Make sure that your paperwork and things are in order though, you don’t want to risk a very angry tenant coming to find you!