How do I get mould out of light grey colored grout?

Try putting vinegar and water in a spray bottle and scrub with an old toothbrush, Sharon.

Surface mold can be treated with bleach, acid is a good grout cleaner but do not use either if the tile is natural stone. You may need to have the grout colorsealed...do not use or attempt colorsealing yourself, hire a professional

Hi Sharon - There are several ways to get rid of mold, but most importantly, you need to address the root cause to keep it from returning. This article focuses on the bathroom, but is an overall great article that covers methods of how to remove mold, if bleach is safe to use, and how to prevent it from coming back. Hope this helps! Hugs, Holly

https://pinkfortitude.com/mold-in-the-shower/

PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean