Add-PSSnapin Microsoft.SharePoint.PowerShell



function Remove-SPFeatureFromContentDB($ContentDb, $FeatureId, [switch]$ReportOnly){
    #$db = Get-SPDatabase | where { $_.Name -eq $ContentDb }
    [bool]$report = $false
     if ($ReportOnly) { $report = $true }
     $db.Sites | ForEach-Object {
          Remove-SPFeature -obj $_ -objName "site collection" -featId $FeatureId -report $report
         $_ | Get-SPWeb -Limit all | ForEach-Object {
            Remove-SPFeature -obj $_ -objName "site" -featId $FeatureId -report $report
          }
    }
}

function Remove-SPFeature($obj, $objName, $featId, [bool]$report){
  $feature = $obj.Features[$featId]
   if ($feature -ne $null) {
     if ($report) {
      write-host "Feature found in" $objName ":" $obj.Url -foregroundcolor Red
  }
   else{
      try {
        $obj.Features.Remove($feature.DefinitionId, $true)
         write-host "Feature successfully removed from" $objName ":" $obj.Url -foregroundcolor Red
     }
      catch {
     write-host "There has been an error trying to remove the feature:" $_
    }
  }
 }
else {
#write-host "Feature ID specified does not exist in" $objName ":" $obj.Url
}
}
Remove-SPFeatureFromContentDB -ContentDB "Your Content DB Name" -FeatureId "e9728ee6-7bfc-40a1-ad72-aa9a57e14407" -ReportOnly