How do I get hard water and soap stains off of tub and showers?

WhatI II used comet cleanser, but rinse well,than towel dry, consider types of finish plastic, porcelain baked or not, New redos out there . New May be cheaper,

i like the product called clr for bathrooms when the build up is heavy. My area is noted for its very hard water and mineral content... lime scale, iron staining. The best way is prevention. When you finish drying off, take your towel and wipe the water off the tub and shower.

The safest and most recommended is repeated applications of white vinegar. I've seen several people advocate for Magic Eraser, too.

Use CLR and some elbow grease

White vinegar and baking soda into a paste,apply and use Mr. Clean Magic eraser,for the shower doors white vinegar,water 50/50 a dab of blue dawn and a dab of jet dry

Bi Card of Soda, white vinigar and lemmon juice, or Chlorine Bleach. I would try white vinigar @ lemmon juice first, if that dosen't remove the stains/martks, then use.Bi Card of Soda. You may need to use an old soft tooth brush as well. I would weare gloves as the Vinigar solution may iritate the skin. If usring Bi Card of Soda, mix a little in to a past apply using an old soft tooth brush, scrub genlty till the stains/ marks come off, then rince and buff dry with a soft cloth. You may need to repeat the processe. If the bath @ shower are made of polystyrene, you need to use a special product. If so, go to your local hardwear store, or boat store, they will tell you what product you need to use for this. Hope this info is helpful. Kay Adelaide Australia

5% store brand white vinegar.