Mindy- OMG I've had the same problem but I tried CLR and HATED IT!!
The fumes for one thing but also the fact that even if I wore gloves if it splashed on my arm or any part of skin it burned!
But I found the PERFECT SOLUTION!!
I saw it on the DIY channel so I decided to try it.
Take a bucket of warm water and add about 1-2 cups of vinegar.
Wet down the tub with the solution and a sponge, rag, whatever.
Put some baking soda on the sponge and rub it on the tub.
WALK AWAY! Let it sit for about 5 min.
Rinse it using the sponge and vinegar solution.
It's kinda fun because it bubbles so much!
I have spent so much money in the past 4 years, after buying this house and having clear glass shower doors, buying Kaboom, powder cleansers, CLR, anything that I could find that might work.
The whole time it was in my kitchen cupboards!!!!
I started using it last year and now I dont use anything else!!
I clean my whole bathroom with it.
Think of the vinegar as spray and baking soda as powder cleanser!
I even use it in my kitchen, and if I just use the vinegar on the counters, I don't have to rinse!
OK, OK I'll stop. LOL As you can tell I love the way it cleans!!
And safe for my kids and pets!!
xoxoxox
Amee