Uninstall all SharePoint solutions

kill_em_all.ps1

$ver = $host | select version
if ($ver.Version.Major -gt 1)  {$Host.Runspace.ThreadOptions = "ReuseThread"}
Add-PsSnapin Microsoft.SharePoint.PowerShell

$spAdminServiceName = "SPAdminV4"
Stop-Service -Name $spAdminServiceName
$deployedSolutions = Get-SPSolution | Where-Object {$_.Deployed -eq $true}
if($deployedSolutions)
{
    foreach($solution in $deployedSolutions)
    {
        if($solution.ContainsWebApplicationResource)
        {
            $solution | Uninstall-SPSolution -AllWebApplications -Confirm:$false
        }
        else
        {
            $solution | Uninstall-SPSolution -Confirm:$false
        }
    }
}
Start-SPAdminJob
Get-SPSolution | Remove-SPSolution -Confirm:$false
Start-Service -Name $spAdminServiceName