This is one of my preferred simple cleansing techniques for cleansing a room of negative energy. It is a traditional method that has been used for a long time when it comes to removing negativity. Some say you can also use it for banishing or warding spirits though I usually only use it for simple cleansing every week or so.

You will need:

• Peeled Garlic Clove
• Small Bowl/Container
• (Optional) Tablespoon of Distilled/White Vinegar

 Simply place your garlic clove inside of the bowl you have and if you desire add some vinegar (said to strengthen the process). You can also optionally add salt or cleanse with salt around it. Take the container and walk around the room holding it before you in one hand and using the other to lightly fan the air towards it. You may choose to do cleansing chants or hums if you wish, though I usually use visualization and simple energy work for this. You want the negativity to be anchored to this garlic clove. Once done place it in the center of the room, preferably at waist height or higher. Leave for one or two nights. 

It is said traditionally that if the garlic stays its natural color or a yellowy color, then there was little to no negative energy in the area. If it turns brown it is said there was moderate negative energy absorbed into it. And if it turns dark or black in that one or two nights there was a great concentration of negative energy in the room. After you are done be sure to toss the garlic to rid yourself of the negative energy trapped within it.