How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)

Question

My version of node is always v0.6.1-pre even after I install brew node and NVM install v0.6.19.

My node version is:

Answer 1

Additional to the main answer I needed to remove all npm instances found in:

rm -rf /usr/local/share/man/man1/npm*