Hi Liz, here's a tutorial, hope it helps! https://brendid.com/ultimate-guide-to-cleaning-grout-and-tile/
Liz, if you click on "explore projects" then "clean" then "bathroom" you will find many ideas. I have chosen one for you and I hope this helps: https://www.hometalk.com/29325620/5-ways-to-clean-your-tub-tile
Baking soda made into a paste with water and a soft scrub brush.
I have listed some things you can use on your shower tiles!
Hi Liz - This is the shower cleaner that we use to help keep grout and tiles clean and minimize the mildew - it works on kitchen grout too. Hope this helps! Hugs, Holly
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