My Grandma used to tell of a widow that had some skunks under her porch. She'd tried everything to get rid of them, but they wouldn't leave. So, she asked the preacher after Sunday service if he knew how to get them gone without shooting them. He told her to put some Lutefisk under there, and they'd move right out. The next week he asked her how that went and she told him, "yah, I put the Lutefisk under there and right away, the skunks disappeared.... but now how do I get rid of all the darned Norwegians?"
In all seriousness, we use a live trap with dry cat food as bait. Once they're in there, get an old tarp or blanket and hold it up in front of you as you walk up, then cover the trap with it. They wont spray when it's covered, and you can carry it down to the water and give them a swim. That's the only way I know of to kill them without having everything smell like a skunk forever.
John