How to regrout barhroom tiles?

They may just need a good cleaning. Here's a link with ways to clean it:

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

This excellent video tutorial should help. It shows how to clean tile with vinegar and baking soda. If that doesn't work, it shows what tool to use to remove just the surface of the group so you don't have to totally regrout it. It also shows how to seal your group once it is clean: https://www.youtube.com/watch?v=ifeSybjr2RY

Hi Charlie, first I would try and clean the grout, regrouting is a lot of hard work. Good luckStir 1/2 cup of baking soda and several teaspoons of water to make a paste you can spread directly over the mold. Apply the paste to the moldy grout, let it sit for 10 minutes, then scrub away with a bristle brush. Rinse with water and repeat, if necessary.Oct 2, 2017

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There are also tips here - this person even uses toothpaste on her grout: https://www.youtube.com/watch?v=AV4t72IYADk

https://www.hometalk.com/diy/clean/bathroom/how-to-make-dirty-grout-look-brand-new-again-for-10-44335421

you can buy a tool to remove the dirty grout and put clean fresh grout in. From personal experience it is always easier to clean it with bleach and a hard scrubbing brush.

If the grout is just gross looking but otherwise intact you could paint the grout lines. They make special paint and pens for that

here is some info to help you out

https://www.youtube.com/watch?v=orJVJKfPovE

Hello, Heres some recommended grout refresh links

Painted Tile Grout Refresh with grout pen

https://www.blesserhouse.com/painted-tile-grout-refresh/

Grout cleaning and grout removal and replace it

Finally-Here’s a Hometalk replacement link for you to consider. Hope this helps

https://www.hometalk.com/diy/clean/bathroom/how-to-clean-grout-and-install-new-grout-that-won-t-stain-23803774 -grout-and-install-new-grout-that-won-t-stain

You can remove and replace. You will need a grout removal blade. Another option is to thoroughly clean and then paint it. I did that recently using exterior paint. Then sealed it. I did another bathroom 5 years ago.

Here are some tips: https://www.hometalk.com/search/posts?filter=grout

Have you tried to clean them? It would be much easier to get them clean and seal them.

You can regrout for sure. Just remove all the old and replace with new. It is a big project. If they’re just dirty, use baking soda and hydrogen peroxide to clean them.

If you want to clean the grout use toilet bowl cleaner and leave it there for a minute or so and then scrub with a toothbrush