Powershell: How to Clear a Variable

Clearing a variable is quite straight forward. One thing to keep in mind though is to leave the $ out of the command.
Also if the variable is an array, we need to remember to remake it into an array again.

Clear-Variable <Variablename>

Example ($Fantastic):
Clear-Variable Fantastic

Remake the variable into an array again.
$Fantastic = ""
$Fantastic = @()