Delete duplicate files in folder

duplicates.ps1

$list = New-Object Collections.Generic.List[String]
$results = Get-ChildItem -Path C:\backup2 -Recurse
foreach ($item in $results) {
    if ($item.Attributes -ne 'Directory') {
        $hash = Get-FileHash -LiteralPath $item.FullName
        if ($hash.Hash -ne '') {
            if ($list.Contains($hash.Hash)) {
                try {
                    Remove-Item -LiteralPath $item.FullName -force -Recurse
                }
                catch {
                    $error[0]
                }
                   
            }
            else {
                $list.Add($hash.Hash)
            }
        }
    }
}