Tenants left house and grounds full of junk!

This isn’t the first time it’s happened to me, but I just have to rant. I have a house I manage where the owners wanted to move back in. Gave the tenants 90 days notice. They found a house to move to about 30 days ago and put in their notice. I suspected they would leave it rough, just based on previous interactions. They left keys at my office today and sure enough, I’m going to have to hire a junk hauler or rent a dumpster to get everything out. It’s never not frustrating. I will never understand how people can do this!