Grout Cleaning

Yes, very thrilling I know, but I found this post on pinterest and had to try to clean my grout.

I have a large kitchen/dining room as well as laundry, toilet and bathroom that are all tiled.
I started in the kitchen, and I must say the cleaner works! As my grout is just the standard grey stuff, it didn't come up like this

source

But it came up nicely.
Now just to do the laundry, toilet and bathrooms........