How can I clean grubby grout?

Toothpaste scrubbed with a toothbrush.

Wash it and then paint it the same colour as your tiles.

Hi Barbara,

Click on the link below from DIY Network and see if this helps. Wishing you the best.

http://www.diynetwork.com/how-to/maintenance-and-repair/cleaning/how-to-clean-grout

i gave up on cleaning it. I found a grout sealant that was colored...and sealed all grout lines. Lot less cleaning involved with the new coating.

I use water and a toothbrush, doesn't take long, but I am the type that grew up cleaning floors on hands and knees. I just think it cleans better than a mop and dirty water and much easier to me.

Ive had success with the foaming Scrubbing Bubbles cleaner.