Am not sure what to use mate, but I also have some rust on ceramic floor tiles, was there when I took over the job and I have tried lots of things on it but nothing touched it.
Probably because the tiles are porcelain not ceramic therefore you need a poultice mixed with an appropriate buffered acid cleaner
Thanks kev
I not really up on chemicals, just basic office cleaning bits, and washing up liquid, bit of rubicon to remove oil from tiles and that's me about done, oh ye don't forget the virosol, I use this daily.
I say ceramic but I couldn't be 100%, it's just a tiled floor to me! I think there was a metal stand there for a few years,
Matt