We have a slug party venue around our front door, have tried everything so the last couple of nights I've resorted to salt. Night one there was one. Last night not a sausage. No sign at all. Yet when we came home from holiday at the weekend they'd obviously been letting out our hallway as a holiday camp. 
What's going on? Are they coming out for a look and then running away or can they smell it? Non attendance was not in the plan