I really dislike those slugs, they destroy some of my plants. I have so many of them in my garden. Someone told me to use beer to get rid of them. When I heard that, I went out to get beer.
I get some small container and filled it with beer. The pungent smell of beer does attract them. When they drink, I believed they will fall inside the container and get drown. It works really well. I managed to catch 15-20 slugs altogether using 3 containers.
However this trick can only be done once. I tried the next day, the catch is not that many. I must try when the slugs have forgotten about it.