Two undiluted coats left for 1.5 days each, and a really light scrub with the back of the dish sponge got rid of the terrible limescale on the shower tiles, which no retail-grade solutions helped, and I'm dead-certain my landlord tried all he knew before me, as the rest of the house is spotless. Certainly give it a go!

Average product. I expected it to be much better than Viakal in liquid form and I didn't see any difference. I also used it undiluted.

After various tests, (Viakal, vinegar with baking soda, etc.) I decided to try it myself. I used it undiluted and didn't leave it for too long.

Based on the comments I have read, I expect it to be more effective. Although it said to dissolve it with water, I used it undiluted in the bathtub and it did not clean all the salts (they did not come off even with scrubbing after use)

I have been using it for years, especially on the tiles of the balcony, which get dirty from watering the plants. It cleans everything without damaging the tiles. However, be careful not to use it on marble, as it clearly states.

Very powerful cleaner that does a tremendous job but requires caution. The instructions state that it should be used diluted with water, but since I tried it and it didn't do anything, I used it undiluted because there was a serious issue with the salts that had damaged the bathtub. I applied it to the area where the dirt was with a kitchen paper soaked in cleaner and left it for about an hour, but with continuous supervision, then the dirt came off with scrubbing. It may cause damage to the bathtub, but it's possible that the damage had already been done by the salts, so at least now it's clean! I, however, was satisfied.

Better than others as a result. I didn't give it 5 stars because I didn't achieve the desired outcome

It saved me!! If it came in spray form, I would prefer it even more. However, it is perfect and odorless.

Good... much better than others. In my case, however, in a humid environment like the bathroom, in a newly built but uninhabited house, continuous applications are needed.

I used it in the bathtub. It really cleaned!! We struggled with various other products such as chlorine, Viakal, etc., but it was in vain. With this, the salts and dirt disappeared