What kind of tile? What have you already attempted to clean it with?

I'm not sure what type of tile. It's a floor tile and I have tried using dishwasher liquid which didn't work. Then I poured harrow which didn't work on it as well. This is a rented property, I'm not sure what has caused this 😳. Any suggestion would be helpful.

where in the home is this? What is that pipe and attachment at the top of it? If there is a water pipe there, I'd surmise it's leaking, maybe under the tile, and pushing iron/rust stains up from underneath.

Helo thank you for helping here. This is in the kitchen. The pipe on top is a radiator pipe. There is also underfloor heating. So would it be something that has leaked from radiator or under floor pipe? The radiator didn't leak though, I don't see any water leaking from it. Haven't seen any water anywhere. How do I clean this? Any idea how this mark can go from tile or will it need tile replacement?

Did it just appear or do you think it was there when you rented? If you haven't done anything to cause the stain, either it pre-existed or something is leaking. Have you notified the landlord? With that pipe in close proximity, it seems likely (to me) that if it just recently appeared that you could have some moisture getting under the tile and pushing rust up from below. Maybe just a pinhole leak, or a leak that's been fixed but caused rust under the tile?

If it was pre-existing (or if you have pets) could be some critter was urinating there.

I might try a little white vinegar on part of the spot, let it set for a while, just to see if it does anything. Your tile doesn't look like natural stone but hard to tell from pics. If it is, you have to be much more careful with cleaning than if it's ceramic tile or cement - so don't use vinegar if it's natural stone without doing some research. You could ask your landlord what kind of tile it is and research cleaning that type of tile.

If nothing else, go to a big box store that sells tiles and look at the selection to see if you can find something similar - it might narrow down the type of tile for you, so you'll have a better chance of choosing the correct cleaning process.

Thank you so much @Olychick these are helpful tips. It has recently appeared and wasn't there before. I have a small cabinet on top of this so I didn't get to know when this came. I have just noticed it last week and since then tried dishwasher soap and even harpic to clean it. But it won't go. Nothing did leak from the cabinet that I have checked and I don't even have pets. But yea it's going to be hard to tell the landlord :(. Thanks for your help, I will try whatever you suggested.