My grout looks absolutely filthy!
If you look behind the sprinkled cleanser, you will see the grout I just cleaned.
The next stepis to work it up into a lather and let it sit for 30 minutes. This is where the oxygen bleach cleans the grout.
Finally, use a mop to finish cleaning the residue. Here is a product I recommend:
This works very well.
Here is the final result (now, I ended up taking a picture from a different angle, so it does not look like the same tile, but it is).
It is a lot easier than scrubbing for hours, sealing the grout every three months or freaking out on the kids.