It does not matter what method of cleansing (exorcising) and blessing you choose to remove unwelcome spirits from your life. The BIG key to a successful cleansing is WHAT YOU BELIEVE and have FAITH in. The second key element is not asking or letting it back into your life. This is a major reason cleansing do not work, we fail ourselves.
Prepare yourself mentally, spiritually and physically before exorcising bad or evil spirits from your home. You cannot do a cleansing half-heartedly or lightly. Doing so will set you and others up for trouble. Smudging is no different then blessing a home with holy water and a cross. YOU have to BELIEVE in what is happening AND that it will be effective.