When my sister wanted to clean her grout with bleach, I was sceptical as I knew it could clean mould but for basic grout, I was not so sure. So, I did some research online and found this informative article that spoke about where bleach should not be used for cleaning and lo and behold it said not to use it on grout. Bleach can discolour and stain the tiles and thus should be avoided. This article saved my sister’s tiles and I was lucky to have found it online in time. If you also want more information on where you should use bleach and not, you should check out the information in this article.
https://www.bondcleaninginadelaide.com.au/7-things-you-should-never-clean-with-bleach/