Copal Incense is a wonderful tool for energy clearing from Mexico. Copal is a tree resin that is burned in various forms. It's used in the same way palo santo and sage are used.
Each incense stick burns for about 1 hour. As with all energy tools, intention is most important.
Tip: before a full moon, close all windows. With a two part intention for your space (to remove unwanted to stagnant energy and to invite positive energy) walk the incense around in a counter clockwise direction starting from the front door. Be especially mindful of corners, where stagnant energy can linger. Once you complete the counter clockwise circle, open all windows. Leave remaining incense to burn for a few minutes in places where you feel the energy is stagnant.