How to keep the grout clean in light-colored tiles?

But it can't be that it only stays bright if you hardly clean?

If our cleaning lady would call that "clean," she could look for another job.

If our cleaning lady would call that "clean," she could look for another job.

Cool guy.

I would honestly also consider incorrect cleaning as a possible cause.

And cheap grout for expensive tiles... well, were you offered deluxe grout or not? To be honest, I also don't think the tiler categorizes Villeroy & Boch as a premium brand, and then makes super-duper grout on his own?!

Wrong cleaning [emoji16][emoji106]

What is now the wrong or the right cleaning?

I would also like to know that