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Try using a Magic Eraser (either Mr Clean or generic). Our tub had the finish damaged (before we moved here) and this is the only thing that works for me.
Try Barkeepers Friend, it works on everything here and we have very hard water, Good luck
Try making a paste of lemon juice and cream of tarter. Place on the tub and let sit overnight. In the morning, just rinse away and the spots should be gone.
two words: pumice stone. I bought a plumber's friend pumice stone, and it cleaned all of the mortar rasidue, rust stains, and hard water stains out of my tub and toilets. It was a $2.99 miracle worker for my bathrooms.
I have the same problem. I make a thick paste with baking soda and water. It takes a little elbow grease, but I have always got the spots to come off.
Try Lime Away. Also, I read a tip in The Complete Tightwad Gazette last night about lemons and....I think it was baking soda....applied to a rough-surface tub that would not get clean any other way. I can check it again for you if you do not have a copy. I HIGHLY recommend this book, it's already saved me tons of money.