There area also some simple rituals involving sweeping, with so e variations.
Some say to sprinkle salt on the floors, typically while directing intent, perhaps visualizing or even chanting, with the belied that salt draws energy to itself the way it draws water.
Sort of a nutshell and combination of methods, begin sweeping at the farthest part of the house, thoroughly sweeping everything to the front door. Of course do this with full intent and belief that you are gathering all the salt with negative energy to the door. Then open the door, and sweep the pile of salt and dust out.
Many people will suggest warding, such as visualizing a shield or sprinkling salt or salt water on all window sills and the threshold of every door, and some people even include warding mirrors, water taps, and drains.
Others will also suggest replacing the purged negative energy with positive, to fill the proverbial void before more negativity has a chance to return.
There are also light-bringing rituals and some very involved smudging traditions. My friend who follows thee beliefs of the Lakota people believes that sage clears all energy -- both positive and negative -- and then cedar and sweetgrass are used in turn to ultimately invite only the desired positive. That is my limited understanding of the matter.
Some people will use incense smoke in stead of sage for smudging.
Options are many and widely varied!