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Floor drain in new house wasn't draining.
(i.imgur.com)
So I dug out a full cup of gravel and silt, along with a small foam ball, a penny, and a nail.
After flushing it with water to make sure it was good and clean, it flows great.
It had a threaded plug to block the cleanout, but it wasn't the right size, and besides the threads in the cast iron are all rusted away. So I filled it with a compression plug. Seems to be working well.
Before:
Well, yes, and in my case, it would obviously be my plumber friend. But he is the first person I've known well enough and trusted enough to want to hire to do something like this. And I'm not buying another house for several years at least, unfortunately.