In TestComplete - How do I clear all the global variables before re-running the script

I am referring to Project Variables but when I want to repeat test again, I would like to clear all global variable to my project so at the end is all new data.  I understand the previous data are overwritten, but to assure myself I prefer clearing everything all at once.  Is there a way to do this in javascript?

These variables are pass down to other scripts within the project.