I put it on the white bathroom tiles to clean the grout that had a slight discoloration in some spots that wouldn't come off. After a few minutes of action, instead of cleaning, the grout turned completely black

STAY AWAY. I used it on my balcony and not only did the circular stains left by the flower pots not go away, but it also erased the grout! When I called durostick for explanations and possible compensation, they said they would call me back but I had to bother them every 15 days to finally find out after almost two months that they were not going to compensate me because they didn't have someone at my house to see if I used the product correctly! Unacceptable. I was forced to bring in a tiler to re-grout 80% of my balcony. Well, 90€ for a day's work was wasted on a bad cleaner. STAY AWAY!

I don't know if it does what it promises,
but I didn't see any crazy difference.
Maybe it's for some other specific use ....

It really disappears!!! Accumulated salts on the tiles, yellowness from the water running from the pots, light rust, and every trace of dirt. It cleans and does not alter the joints of the tiles. I used it on the floor of the terrace which is made of beige-brown twig. The terrace became new!!! and not just like new!!!

I got it to remove polyurethane foam from tiles. I left a small amount on for 3 minutes, lightly scrubbed it with a sponge, and it came off.. Very good product

I got it today as well. Perfect. No scrubbing. I filled a basin with water, poured plenty of the product, took a brush with a handle to be a little hard and scrubbed. And then wiped with a sponge. It does what it promises. I removed residue from grout. Excellent result

Dirty tiles over 15 years cleaned perfectly, we took 3 liters for 65 sqm and half a liter was left. I poured a little liquid on each tile and with a wet carpet brush I rubbed a little, then I wiped. I highly recommend it for sure

Stains from pots, rusted and blackened joints, it cleans them with a little scrubbing, corrodes drainage grates, and generally anything iron smells strongly. I wouldn't use it without a mask, especially in enclosed spaces, not at all

Cleaned the tiles on the balcony from the water of the pots that had been watering all summer. I will simply need more. It is more convenient in larger quantities. Maybe 5 liters.

Two photos are from the terrible condition of my floors before using it. The tile is ceramic porous, the worst thing. Wet the floor and put the product in a bucket, use a hard brush for carpets and scrub (it requires some work) tile by tile, leaving it to act for about five minutes. Rinse with plenty of water using a hose.
My balconies became new. I bought it because I saw good reviews.
Great value for money purchase!

Amazing product, incredibly effective! We used it on ceramic tiles, which easily 'absorb' stains, and it removed stubborn grease stains from wax, as well as organic oils. I highly recommend it.

Very effective, it removed colors/stains/construction residues in just one application.
Definitely wear a mask and gloves during application, as it is very strong.
You should remove anything metallic nearby. I forgot about a garden faucet and it made it look like it was 200 years old.

It does exactly what it says. I used it on my balcony and it became like new. It smells quite strong, but it was outside. Maybe I'll wear a mask next time though, for better protection.

I did not expect this result. My balcony had been poorly done, resulting in water pooling on the opposite side of the drain and leaving stubborn stains that couldn't be removed even after a year of using chlorine and endless scrubbing. I used this product and with just one application and a little scrubbing with a broom, it didn't make it look brand new, but I am 100% satisfied because I had seen the comments and thought they were exaggerated based on their price and the terrible condition my balcony was in before. Unfortunately, I don't have a before photo because I also didn't expect such a result.

I used it on the marbles on my balcony. Although outdoors, the smell was very strong, so it would be good to wear a mask for the fumes. The surface started to "froth" and the foam turned black. The result was amazing.

Amazing product, it does exactly what it promises. You just drop a drop and the seams foam up, removing any odor that exists. It requires a little caution with the gases and the smell because it can make you dizzy with what that entails

Very good cleaner for surfaces such as the old mosaic on the balcony and bathtub with stains.

It does the job. It definitely gets rid of dirt. It's good to use only on the joint because it left a stain on the tile. It had no issue on granite.

It cleans deeply tiles and grout. You pour it on the surface and it produces black foam because it removes anything useless that has stuck on the tile. It is good to have a hard brush to scrub the grout a little with pressure. Be careful not to inhale too much because it feels like it burns you.

The product is excellent, I will order more! I had stains on a ceramic tile in the bathroom and rust on the balcony, they disappeared!!!!!

I was expecting it to be much stronger, it took a long time and scrubbing to remove the paint from the tiles.

It works perfectly to remove dirt/cement from tiles... you simply pour it, let it act, and then pour water and wipe (I used it on the balcony). It is not meant to remove splatters from colors on tiles. Be careful, it has a very strong smell, wear a mask, thick gloves, and protect your body

It cleaned without any effort colors and stains from adhesives on tiles and joints. They became like new. It just has a strong smell, so it should be used with open windows.