Here are some things that I have found effective for my location:
*Essence bottles in the corners of my living room containing the essences of: White Sage, White Copal, Actinolite, Green Fluorite, dried Sage, White Copal resin and a bit of clear 'Sole' (dissolved pink salt in water that has settled - apparently this clear salt solution makes the essences more effective for some reason).
*Diffuser with a blend of essential oils and essences that go well together - for example: an essence or essence blend for clearing, combined with some clearing essential oils.
Some of these:
Shanti Kai - Clear My Space: http://www.shantikai.com/shop/clear-my-space-essence-spray/
Petaltone - Astral Clear: http://www.petaltoneusa.com/petaltones-premier
Use the same as Crystal Clear, with these exceptions: When clearing spaces, use a vaporizer instead of a spray; when clearing crystals, apply the essence via drops in your palms. In short, don't use Astral Clear in a spray!
Use this essence in an essential oil vaporizer/diffuser, either electronic or candle-powered, or via a ceramic ring on a light bulb. Clean the vaporizer or ring, fill with water—and add a few drops of Astral Clear. It can be left in a corner, diffusing for many hours. This unobtrusive method is useful in treatment rooms. To shift deep, dark stuff, keep it going for days, even weeks. Astral Clear really gets through it!
Serious Cleansing: for really tough clearing of deeply resistant or ingrained negative energies, use with a crystal. Add a couple of drops to clear quartz and direct the crystal to send the essence into the space.
*Energy flow - making sure the furniture is arranged in a way that is conducive to the energy flow throughout the place.