You should follow some basic steps to keep the tile and grout clean at all times. Keeping things clean is not rocket science, if you do not clean yourself during the week you will be dirty too. You may need extra scrub to cleanse them too, because the dirt is built on the dirt and make things more difficult to clean.
Cleaning your tile and grout regularly will stop it from getting as dirty. It will help break the habit of getting on your hands and knees every two months to scrub your floors. You can also look for professional tile and grout cleaning in Perth via https://www.pridecarpetcleaning.com.au/service/tile-grout-cleaning-perth/.
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When the dirt doesn't have enough time to build it comes off much easier and your tile will keep the original shine. Avoid commercials that promise the world after one use, nothing gets clean that fast.
Even if you're cleaning your tile on a weekly basis you should still specifically clean the grout on a monthly basis. Doing this will stop the grout from changing colors. If you're grout color is different than the original color then you weren't cleaning it enough.
The dirt builds on the tile, then it gets shifted into the grout lines and then it gets packed down tightly. The only way to stop the color change is to clean the grout on a regular basis.
Walking on a dirty tile floor with dirty sneakers makes floors even more difficult to clean and more difficult to avoid grout build up. The longer you let it sit the more expensive formula you need to buy in order to get the stains out of your grout lines.