When I first learned about subtle energies, I learned the importance of clearing the living, work and play space energetically, not only physically.
When Chi becomes stagnant, it gets sticky, and it feels as if you are trying to move through taffy. Your cleaning efforts are directed at dispersing the stagnant Chi and allowing for free flow. Chi gets stagnant in any room or area of your home that you don't use; around crammed objects in small spaces, such as books on shelves or collections of any kind (unless they are contained behind doors / glass); nooks and crannies.
To disperse the stagnant Chi and create free flow, use any of the elements: Earth, Water, Fire and Air.
Use gemstones, crystals, shells and of course, potted plants, to raise the vibrations of the space.
Have a small decorative fountain in a corner of the living room. Or, pour a few drops of essential oil (lavander or orange and cinnamon, or bergamot) in a spray bottle of water. Shake well and spray around the room, home or office.
Candles are the easiest way to burn cleansing fire. Unless, of course, you have a fireplace!
Smoke represents air. Create smoke from burning sacred plants (sage, sweetgrass or cedar), or from burning incense sticks, or Papier D'Armenie, or from burning Frankincense and Mhyrr resins on a hot charcoal.
Sound: you can use sound to disperse energy: a crystalline sound bell; drums; or clapping hands. Or you can play music in any corner of your home.
Photographs, books, sacred objects: As a golden rule, if it energizes you to look at it, it energizes the space.
Further reading: Karen Kingston 'Creating Sacred Spaces with Feng-Shui'