KKings/remove-orphan-renderings

## remove-orphan-renderings
$items = gci . -Recurse

Foreach($item in $items) {

    $allRenderings = Get-Rendering -Item $item -FinalLayout
    $dynamicRenderings =  $allRenderings | Where-Object {$_.Placeholder -match '(-{[0-9a-fA-F]{8}[-][0-9a-fA-F]{4}[-][0-9a-fA-F]{4}[-][0-9a-fA-F]{4}[-][0-9a-fA-F]{12}}-0)'}

    $regexOptions = ([System.Text.RegularExpressions.RegexOptions]::MultiLine -bor [System.Text.RegularExpressions.RegexOptions]::IgnoreCase)
    $regex = new-object regex('{[0-9a-fA-F]{8}[-][0-9a-fA-F]{4}[-][0-9a-fA-F]{4}[-][0-9a-fA-F]{4}[-][0-9a-fA-F]{12}}', $regexOptions)

    $results = New-Object System.Collections.Generic.List[Sitecore.Layouts.RenderingDefinition]

    Foreach($rendering in $dynamicRenderings) {
        $matches = $regex.Matches($rendering.Placeholder)

        if ($matches.Length -eq 0) {
            return;
        }

        Foreach($match in $matches) {
            $id = [Sitecore.Data.ID]::Parse($match.Value)
            $isFound = ($allRenderings | Where-Object { $_.UniqueID -eq $id } ).Count -gt 0

            if (!$isFound) {
                $results.Add($rendering);
                break;
            }
        }
    }

    #Write-Host "Found $($results.Count) results for ..."

    $device = (Get-LayoutDevice "Default")

    Foreach($result in $results) {
        $renderingItem = gi -Path 'master:' -ID $result.ItemID
        Write-Host "Removing $($renderingItem.DisplayName) with $($result.UniqueID) from $($item.Name)-$($item.ID)"
        $item | Remove-Rendering -Instance $result -FinalLayout -Language 'en-US' -Device $device
    }
}