Found it
$CollectVMs = Get-VM -name *
foreach ($vm in $CollectVMs) {
$vmObj = Get-VM -Name $vm
$si = Get-View ServiceInstance
$scheduledTaskManager = Get-View $si.Content.ScheduledTaskManager
Get-View -Id $scheduledTaskManager.ScheduledTask |
where { $vmObj.ExtensionData.MoRef -contains $_.Info.Entity } | % {
$_.RemoveScheduledTask()
}
}