Like others have said clear it with the wife.
I'm situations like this I like the other party involved to set a deadline. Have a conversation about the situation. Explain you need the stuff gone. Get them to chose a date to have it gone by. Be firm if they try and be jerks about it and say 6 months. Agree on a date that works for you. Explain what you will do when the deadline passes. If the deadline comes and goes without action do what you said you'd do with a guilt free conscience.
I wouldn't send a bill if you had someone clean it up or did the 1 800 got junk thing. This is family. Just try and look at is as the cost of helping a family member out.
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