Hi Guys,
I am trying to clean my outdoor tiles which have stubborn marks. I have tried few cleaning products from bunnings, water pressure, and hand scrubbed with brush but cannot get marks out. I was advised it is possibly because of nature of tile as it has rough texture for outdoors. These are only 1 year old tiles.

Is there any easy solution to clean this?
The other options I am considering at last moment are either Re tiling or Modular Deck/Tile from Ikea.