Your gonna love this one.
We all love a good party right! Well it just so happens that slugs and snails love a good party too.
Just open a can a beer and poor it into a pie plate and set it outside. The rather loathsome mollusks will come to the party and drown.
Try it, it really works and it works great. In a few short weeks a bad infestation can be nearly complete wiped out.
If you have a really, really bad problem set up a bar. Place 5 or 6 plates out.