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I have found that putting sea salt in the corners of each room and lighting incense and candles for a few hours, then cleaning up the sea salt and throwing it out in the trash can really help clear the negative.
I think that having rituals to symbolize releasing and starting fresh are very important symbolically, and I am working on this now.
Amethyst is supposed to be wonderful for absorbing all negativity, cleanse in sea salt and water daily.