For clearing a room wave your arms around as if you are sending the words to all parts of the room, as you turn clockwise.
It is like a spiritual smudging. Make sure you repeat the whole Mantra three times, as many times as needed.
KO.DOISH,
KO.DOISH,
KO.DOISH,
ADONAI SABAYOTH
It means:
Holy, Holy, Holy, is the Lord God of Hosts