How do you clean a travertine floor?

I recently had a travertine floor laid in my kitchen. It gets covered in marks.Conventional household cleaners and mopping have no effect. I have to get down and scrub. The floor was treated after being laid with Hagesan Impregnator so is properly sealed. There must be something to clean it.

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).