remove-all-webparts.ps1

#existing stuff, do not copy:
$url = "https://some.contoso.com"
asnp *share*


#remove all webparts

$step = "Deleting Existing Webparts"
$pageUrl = $url + "/Pages/default.aspx"
$site = new-object microsoft.sharepoint.spsite $pageUrl
$web = $site.OpenWeb()
$pageItem = $web.GetListItem($pageUrl)
$requresCheckout = $pageItem.ParentList.ForceCheckout
$requiresApproval = $pageItem.ParentList.EnableModeration
$wpManager = $web.GetLimitedWebPartManager($pageUrl, [System.Web.UI.WebControls.WebParts.PersonalizationScope]::Shared)
$webparts = $wpManager.WebParts
if ($webparts.Count -gt 0) {
    if ($requresCheckout) { $pageItem.File.CheckOut("Online",$null) }
    $wpManager.WebParts | % { $wpManager.DeleteWebPart($_.ID) }
    if ($requresCheckout) { $pageItem.File.CheckIn("Removed all web parts",[Microsoft.SharePoint.SPCheckinType]::MajorCheckIn) }
    if ($requiresApproval) { $pageItem.File.Approve("Automatic Approve. (Administrator)")  }
}