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A good protective sachet can be made from some common kitchen herbs and spices. Combine black pepper, sea (or table) salt, sweet basil, and caraway seed - garlic is also good, but if you're using the sachet in a car or office, the close quarters (in a car) or others (in your office) could make using garlic less than desirable.
Wrap in a white hanky or cloth bag and tie with a red cord (or red yarn). Hang in a high corner of the area to be protected. Picture the scent/vibrations of the herbs enclosing the area.