How to get water spots off glass shower?

Have you tried Dawn Dish detergent?? Then rinse it well and use a squeegee. If it's from hard water, I would try a vinegar gel glass cleaner.

I would take piece of vinyl - like you would use with a cricket or silhouette cutting machine - place the pieces on the adhesive side (exterior to the adhesive). When you have everything in place, use some E6000 glue to fill in the cracker. The use some tape or elastic to pull the pieces together and hold them into place until the glue dries.

Sorry applied to wrong post.

use white vinegar on a rag or sponge, and wipe with micro-fiber cloth, once it is dry the vinegar smell will disappear.

I take a bunch of used fabric softener sheets saturated with vinegar and wipe the glass down.

Here's a tip from Reader's Digest:

"Clean them with vinegar, baking soda, and salt. Stubborn mineral buildup on glass shower doors is no competition for a few common household ingredients—white vinegar, baking soda, and salt. Spray vinegar on the door and let it sit for a few minutes. Next, create a paste with equal amounts of baking soda and salt. Use adamp sponge to rub this paste over the door; then rinse well."

So many are so close with a good answer . I use a 32oz. spray bottle . fill with 8 oz. of blue dawn dish soap and then the rest with white vinegar . takes off scum and spots good for shower walls and bath tub cleaning