Stop slugs in my living room?

I live in an old rented house, my garden is just a yard so I'm not sure why or where they are getting in. I find them every night in my front room so I put salt all around the skirting boards. Now they are in my bathroom! It looked like it was oozing its way out from under the bath! They seem to like a particular corner where I have a chest of drawers?! There is no food anywhere in my house for them that I can think of, no pot plants or vegetable peelings.