Powwow is the spiritual part of a nature religion based on spirits that are empowered by chanting, dance and worship.  All spirits other than the Great Spirit are actually demons posing as these plants & animals.  The worship adds another level of complication to clean up.

The first step is to ensure you have the authority to do the cleanup.  Pray: "Our Father who art in heaven, I receive Jesus Christ of Nazareth, your Son, to be my savior and master. I will trust and obey him for the rest of my life. Amen."

"all the other animal and plant spirits"

For each of the above kinds of demons, pray:
1. "I renounce _______ that I or my ancestors received, in Jesus' name."
2. "I break the power of trances, chanting, rattling, dancing, drugging, sacrifices and drumming given to _______ in Jesus' name." 
3. "I command _______ to leave me, my family, my property, my finances, those who have helped me -- and any charmed objects that affect me in Jesus' name.  Amen."

 #1 is needed only the first time you go through the whole cleanup.

Now pray the following mop-up prayer:
"Our Father who art in heaven, open my eyes to see any objects I might have that are still contaminated that must be gotten rid of. I unstack the Kundalini in me down to elementary demons.  I command the elementary demons to leave now.  Fill me with Your Holy Spirit in all the areas that these demons have left. Protect me from sickness, harm and accidents. I thank you for all you have done for me, in Jesus' name. Amen."