Remove Theme from Site in SharePoint 2013 using PowerShell

Requirement: To enforce consistency, We wanted to reset custom themes applied on SharePoint sites by end-users in our SharePoint environment.

Solution: Remove theme programmatically using PowerShell!

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Variable
$WebAppURL = "http://intranet.crescent.com"

Get-SPWebApplication $WebAppURL | Get-SPSite -Limit ALL | Get-SPWeb | ForEach-Object {
#remove theme sharepoint 2013
$Theme = [Microsoft.SharePoint.Utilities.ThmxTheme]::RemoveThemeFromWeb($Web,$false)
$Web.Update()
}
Write-host "Themes are removed from all sites!" 

This removes and resets to default SharePoint theme. The same script works for SharePoint 2010 also to remove theme.