I use sound. A clear bell (I use one of those desk bells you find in hotels) produces a clear tone that, while annoying in multiple strikes, with a single reverberation seems to push negative energy away from its path. I usually do this:
1. I carry the bell with me and use the sound waves to smudge the house, or person.
2. I then set up wards around the house or on the person to keep any negative energy from coming back.
3. I speak a blessing over the whole house or person, to cement the wards and boost their power.
This doesn't always work, so I sometimes have to delve into the Dreamscape, usually by pulling the entities with me, and fighting them there, or imprisoning them. But I've only had to do that once. The above usually works just fine. You can substitute the burning of Sage or other incense for the clear sounds of the bell, if you prefer, or if you just can't find a bell you think is clear enough. Your call.