It's gross. Have been battling with the problem for years and can't get rid of them.I can't put Pellets etc down as I have dogs, young children and guinea pigs.
If I see them then I get them out the house - usually over the fence at the bottom of the garden. It's quite a big garden and we have no plants what so ever (we have artificial grass, concrete and decking) so I can't see why they keep coming back.
But most of them seem to come out when I am asleep and go before I wake up. But I wake up to slug trail everywhere 
It's gross. I hate it. We have had our flooring changed and re done the skirting boards and we thought that would stop them getting in from under the house which seems to be where they originate from (but not 100% sure) But it hasn't helped much.
How do I get rid of the things for good?