Clear your mind and light the white candle. Say the following incantation:

Mother Earth, Fire, Wind, Water and Spirit,
I ask thee to cleanse my body of all negative energies

Light the black candle and say the same incantation:

Mother Earth, Fire, Wind, Water and Spirit,
I ask thee to cleanse my body of all negative energies

After this light the green candle and say the following incantation:

Mother Earth, Fire, Wind, Water and Spirit,
I ask thee to free and heal my body from all negative forces.
Blessed be!

Sit back, and keep your mind clear for fifteen minutes. After this you should feel renewed and fresh.