This should be done on the waning moon, as close to the New Moon as
possible. Raise athame in salute to the Goddess and God, asking
their assistance in your "house cleaning".
Now, beginning at the front door, walk throughout your home, deosil
[clockwise]. At each window, door or other opening make an invoking
pentagram with your athame [invoking, because it is invoking protection].
You may wish to chant as you mark these pentagrams. The one I use is:
"Lord and Lady of the day, Keep all harm far away, Set your guard
ever near, Let no evil enter here."
After you have gone through your entire living space, visualize the
three-dimensional outline of your home being completely made of, and sealed
with, white light. Thank the Lady and Lord for their aid.