Quote from Activating CleanBrowsing
Activating CleanBrowsing is pretty simple and only takes 5 minutes. We do our work via DNS, so you have to switch your DNS servers to go through our Network instead of the one provided by your ISP.
- Safe browsing experience - across all devices.
- No porn and no surprises for your kids and you.
- Youtube, Google and Bing forced to SafeMode.
How do they force Google and Co with only DNS into Strict Mode?