I just finished cleaning my shower doors with Bathroom Magic 6-in-1 Hardwater Stain Cleaner. Not only do they sparkle and look like new, there was no chemical smell or difficulty breathing, as I've experienced with CLR or other such cleaners. I followed the directions exactly and only had to wash the doors with a sponge and rinse...nothing else! It's easy to use, and the results are wonderful. I'm in my 70s, a bit of a "clean freak" and have tried many products over the years. This one is by far the best. Great product and great results!