Hello @RK2
Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about cleaning your outdoor tiles.
I suggest having a quick look at our best advice - How do you clean outdoor tiles? Starting off with a soft approach using a soft bristle broom and light detergent is always best as it will not harm or discolour your tiles. Using a chemical cleaner such as Glitz 5L Outdoor Cleaner Concentrate needs to be tested in a small corner first to make sure that it will not harm or discolour the tile.
If you have any other questions we can help with, please let us know.
Eric