Rain-X 630544 X-Treme Clean Shower Door Cleaner, 12 Fl. Oz, Formulated To Glass Doors - Removes Soap Scum, Dirt, Hard Water Build-up, Calcium, Lime & Rust Stains (Pack of 2)

Wet shower glass and put it on the glass with soft rag then I use a scrubber to take off hard water build up and then rinse and wipe clean. Stays that way too. I use 1 time a month to keep shiny glass.sometimes I just spray a good glass cleaner and scrub with a scothbrite sponge rinse and wipe.

Doesn't work on the shower after a few weeks.

This stuff is great. Really nails calcium build up. (Old shower doors where the glass has been etched, nothing works.) I used this with the finishingpolish on my motorcycle fairing. I didn't rub hard. Followed by the Rain X polish the rain rolled off leaving a clearer view of the road ahead. .

Me encanta este producto para los cristales, 100% recomendado he probado otros y no limpian igual, solo un poco y una esponja y los cristales quedan limpios.

This product seems to work and remove hard water stains. It does take a couple passes and scrubbing. Some spots around the edges are hard to get. The product is fragrance free too, so not having a smell makes it easier to deal with while cleaning. Also did not take as much product as I thought it would. Was able to clean my whole shower with just some of the bottle.