I've recently had a slate floor put in my kitchen and I love it, all the tiles are different sizes and although it pissed my builder off no end it's been so worth it!
However, I have just tried to clean a couple of marks off it by the cooker, and althought the actual dirt came off it has left a mark. We did have it sealed so I don't understand how this has happened! Is it going to do this always, do I have to resign myself to the fact that it will gradually look dirtier and dirtier forever? Am going to be gutted if this is the case, please someone have good news for me!