My buddy Jo gave this to me years ago from her defunct site spellbox.com and it works like a charm.
Purpose of the spell: To remove negativity prior to performing a spell
Best time to perform spell: Anytime
Best moon phase to do the spell under: Any
Herbs to use: Bay leaves – 1 to 3 leaves
Supplies needed: Charcoal (for spell work not the grilling variety), match/lighter, fire proof container
Incantation:
Light the charcoal*, place in fireproof container (not metal).
Place the Bay leaves on the charcoal while saying:
Bay of protection
Fire of light
Encircle (Name) atmosphere
And remove all negativity that dwells within.
So mote it be.
*Note: If you do not wish to buy charcoal for the spell, either light a piece of paper to place the bay leaves on, or simply light the bay leaves directly.