You can also make your own cleaner. Mix 0. 5 cups (120 mL) of baking soda into 1 gallon (3. 8 l) until the baking soda is completely dissolved. Add 5 drops of liquid dishwashing detergent, and stir gently to combine.
You may need to scrub the grout a bit harder, but it will likely still get darker over time. [13] X Research source
Caustic soda cleaners are safe to use on quarry tiles as long as you dilute the product properly. If you apply too much caustic soda, you’ll get a white film on the surface of the tiles.
For instance, you may use 1 part cleaner to 32 parts water for a 3% dilution. [18] X Research source Some products may recommend that you use cold water when you dilute the product so check before you begin.
If your product doesn’t say to let the product sit, skip this step.
If you still see a greasy spot or white limescale, you might need to do another treatment with the caustic soda cleaner.
