Baking soda cleans and polishes tiles in one pass: use it like this

Baking soda is always mentioned among the most effective methods for cleaning floor grout lines. Applying this method is very simple: create a creamy solution by mixing baking soda and water, then use a stiff sponge to scrub it between the joints. Remove with a clean cloth, then rinse with plenty of water.

Hydrogen peroxide

As weird as it may sound, hydrogen peroxide is also a great help in cleaning and whitening grout lines. Simply pour a little hydrogen peroxide between the joints and clean with a sponge or brush.

White vinegar

Probably the most effective natural product for cleaning joints, white vinegar also has antibacterial properties capable of disinfecting joints. In this case, you have two options. The first is to dip a toothbrush in vinegar and clean the joints. Or mix two equal parts baking soda and water and spray the solution between the grout lines. In both cases leave on for 10 minutes before rinsing.

In any case, a little patience is required, especially if the joints are very dirty . Remember that after cleaning the grout, you need to wash the floor to ensure you have removed all residue.