How to clean yourself spiritually after being in contact with someone who is negative and into black magic?

If I came in physical contact (handshake, hug) with someone who is very negative and is into black magic, how do I clean myself spiritually from that person's energy? I know baptism is one way. Is there anything else that can be done? Cleansing, bath, go to church, be blessed? If that person sends dark evil spirits to my house, how do I break that? I can't touch members of my family because of that contact, and it doesn't feel good, especially when it comes to me not being able to touch my kids? I have to fix this problem. I need advice. I hope there is someone who can help me. If you're spiritual, I would like to talk more about few other issues, but privately.