How can I clean the grouting between the tiles in the bathroom?

Is not getting clean? Or not staying clean? Once you clean it with baking soda and vinegar and scrub it really well , now you have to seal it so it will stay that way . Sealant can be purchased at your local home improvement store .

I make a solution of vinegar water - 1:10 ratio. I use it to clean my tile floors and grout. I learned this from a tile installer. I use a deck brush to lightly scrub away the dirt with it. The acidity in the vinegar is what does the cleaning. I also use this same solution & technique in my shower and it works great. I do recommend sealing it after you get it clean as grout will wear away over time and this is a better way to help it last longer.

If you have tried CLR and other products you may be left with stained grout. You can buy dyes that allows you to redye darker and the stains are "stained" out. Please forgive the pun.

Have you tried this one? Spray it on and use a veg scrubber in grout lines. If you want it to "soak" longer, spray it on and then cover with Saran Wrap so it stays and doesn't evaporate or run down the wall.

Miracle Cleaner

Into a spray bottle mix:

2 oz. Dawn Dishwashing liquid

4 oz. Lemon Juice

8 oz. White Vinegar

10 oz. Water

1 cup baking soda and 1/2 cup of Hydrogen Peroxide 3%-put in the jar and shake. apply to the the tiles and in between set for 5 minutes. i use old tooth brash to clean, wipe and buff with old rug or towel. works great on kitchen tiles too. good luck.

If it's the floor I use the liquid Vim bleach stuff and cover all the lines with it and wait a while then scrub it. If that doesn't work you can always use grout pens and 'paint' them.

I use toilet bowl cleaner. Just squirt it on, let it sit, and it wipes clean with minimal effort.