To verify env vars in a new session:
  [System.Environment]::GetEnvironmentVariable("VPATH",     "User")
  [System.Environment]::GetEnvironmentVariable("VAULT_DIR", "User")
  [System.Environment]::GetEnvironmentVariable("ID",        "User")

To remove everything:
  [System.Environment]::SetEnvironmentVariable("ID",        $null, "User")
  [System.Environment]::SetEnvironmentVariable("VPATH",     $null, "User")
  [System.Environment]::SetEnvironmentVariable("VAULT_DIR", $null, "User")