I have a Native American Shaman influence that through use has worked well for clearing the negative energy from around my corporeal body. Use a smudging stick made from sage, light it and move it in a circular motion clockwise around one's body.
Once I felt somewhat dizzy. I obviously seriously needed this clearing! Also use this method to clear the dwelling that you reside in. If you live in Nature it is also great! I love looking up at the Skies in Nature on a full moon.
There are many methods of clearing negative energy. A sage smudge stick is once way, as is using copal incense, or a refreshing cleaning bath with purifying and cleansing herbs. Wearing black tourmaline, bloodstone, or rose quartz is also helpful in cleaning and banishing negative energy, harm, and bad Juju. The Lesser Banishing Ritual of the Pentagram or other variants of it is also a powerful and effective deterrent. Of course there are many other ways including those that are path specific.
Another way to clear your space of negative energy is to consecrate your tools to the Lord and the Lady Lord partnered in power that you are most comfortable with for this activity. As Everyone knows Wicca is a Polytheistic Spirituality such as the other Majickal Spiritualities. Consecrate by invoking them.
Tools: White unscented candle
Pachouli Essence Oil
Pachouli insense in stick form for ease of work
White or clear lighter
After consecrating of tools coat white candle with pachouli oil
Light insense stick. Carry around both white candle and insense stick of pachouli clockwise around your space after invocating the Lord and Lady Lord
I did a house clearing just last weekend. I used sage and Palo Santo cone incense. The house owners had had some spirit activity and as they have a young child, we thought it best to do a smudging ritual. The Sage clears the spirits out and the Palo Santo brings in blessings.
A good way to ground yourself is to walk bare foot for a while on the lawn.