Has anyone used Nix safely?

[Snowshoes]

I've been doing some research about using nix is a 1:64 part solution to kill mites and their eggs. I'v also seen people talk about using a 1:1 ratio with Nix. Which is safer? I would thing common sense would dictate using the least amount of chemicals. I also read that it's safe to put on the snake's head. Is this safe? Any personal experience, or advice would be great. I haven't treated my ball python with nix yet, I've been using something we bought from the pet store, but it isn't working. I just wanted to figure out a way to treat her without hurting her.

Thanks in advance