# Checks all drives on server (get-psdrive) and runs a loop
# for all folders in that drive's recycle bin (:\$Recycle.Bin)
# for any files that have been in the bin for more than 30 days --> AddDays(-30)
# author - m8r
ForEach ($Drive in Get-PSDrive -PSProvider FileSystem) {
    $Path = $Drive.Name + ':\$Recycle.Bin'
    Get-ChildItem $Path -Force -Recurse -ErrorAction SilentlyContinue |
    Where-Object { $_.LastWriteTime -lt (Get-Date).AddDays(-30) } |
    Remove-Item -Recurse
}