If you don't know for sure you can surely place an ad using free classified ads websites and ask for feed back from other people who have already solved this issue.
 

 Maybe you should secure your house better. If it was build after the 80's, then you might have some problems,.I, for example, i've put double bathroom vanities in my outside bathroom to our vacantion home so that bugs or mold would not appear.I think that you find special solutions for cleaning that are meant to keep away slugs.

Three years ago I moved in a new house near the sea and I had a lot of slugs that were invading my house and they were awful.I've bought some great cleaning products from Buffalo classifieds and since I've started to use them I didn't have slugs anymore inside my house.

This isn't the first time I hear that. No matter if you're invaded by slugs, ants or anything else, I guess you should secure your entrances. Tell me how that went.

Salt usually works, keeps them off. Slugs tend to come in areas of darkness, perhaps you can consider putting fairy lights at your yard and entrance to prevent them from coming close to your compound.

John
http://www.ldj-lights.co.uk/