Vinegar and water.
Fill a spray bottle with a 50/50 solution of Dawn dish soap and vinegar. Spray it on the shower and let it work. If they are tough hard water stains, you may have to scrub with a plastic scrubbie!
I use Tilex if tile and scrub with a scrub brush. Be sure to seal once clean.
Hi Janice - 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
This might help: https://www.hometalk.com/1199445/shower-cleaning-made-easy-without-the-use-of-noxious-chemicals
Here are some Terrific Tips to Clean Your Home Without Chemicals. I hope this is helpful to you!