We went for the little blue pellets when they moved in under our shed (think they were attracted in from the fields by the rubbish someone a few doors down seemed to be accumulating). We occasionally get mice under the stairs and I'm afraid a trap deals with them (not an humane one as it they're released they'll find their way back). The dogs sit with their noses against the understairs cupboard door if the think we've got 'visitors' in there so we soon deal with them.