Can I clear variables within a loop?

I have someone else's code that I need to modify to run in a loop. It wasn't originally written with this intent. I know that it's generating erroneous data and I suspect that it's keeping the last output from the previous run before going into the next loop, so I want to clear the variables before doing this.

Is there a way to clear all variables globally, or do I need to write code to clear each one?

I.E.

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???

Thanks in advance.
-gshock