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Oh damn that really sucks. Have you tried to use a form of slug and snail killer? I use Bonide Captain Jack's Bug & Slug Killer and it works really well if you follow the directions on the bottle.

I don't really like using the pellets but I did put down a few. Trouble is, we've had so much rain this year it has been great for slug production (!) so there's been even more of them to contend with than usual.