In a script where multiple variable are used is there a way to clear them to nothing once the script is done.

I'd love a way to clear all variables with about have to specify each and every one.

Local script variables (single $) don't need to be cleared. You could arrange your script to only use those. If you're calling subscripts, you'd need to pass those locals to other locals via a Script Parameter.

Set them to null ("").

As DJ says, it's best to use local variables unless you have some reason to use globals.

As Vaughan notes, you clear a variable the same way you clear a field: setting it to "".

One nice technique to know is that you can set multiple variables in one step using a Let calculation like so:

Set Variable( $clearMyVars ; 



  Let( [ 

    $$var1 = "" ; 

    $$var2 = "" ; 

    $$var3 = ""   ] ; 



    "voila" )



)