Very good for limescale
ATTENTION TO NICKEL SURFACES IT DULLS THEM
it turns limescale to dust (toilet scale, bathtub, and others, it's super)

Amazing, it cleaned rust and stains from pots on tiles almost without scrubbing, which nothing else I had tried could clean.

Guys, there is nothing like it, I discovered it completely by chance, it cannot be compared to anything. I'm not talking about polishing or just removing recently formed limescale from sanitary ware, but after long-term deposits that are impossible to remove with anything you have tried (I consider viakal to be the best). With this specific product, it looks like new. Of course, I'm referring to very difficult cases, not for everyday use

Unfortunately I lost the photos to show the work it does. For years I tried various products (for a toilet bowl) without any results until I found this product that is so effective and fast. In an hour all the dirt had disappeared. No need for scrubbing. You pour the liquid, wait for an hour and it's ready. So simple. It's worth the money.

It does what it promises WITH VERY CAREFUL FOLLOWING OF THE INSTRUCTIONS. Waterproof on tiles and joints is very good, but it has many fumes. So be careful.

Very good. I cleaned the joints on the bathroom floor by lightly scrubbing them and it became like new! It also did a good job on the toilet bowl. To clean the entire grout, does it require a larger quantity than what I used or does it need to be used without water?

Quite a good cleaner for professional and household use. It needs to be used two to three times for a very good cleaning, depending on the case.
Attention...
When using it, wear a mask and gloves, and make sure it doesn't fall anywhere else, as it is quite corrosive!!
Leave it for 8-10 hours for good performance at least and make sure there is good ventilation in the area.!!