Hydrogen peroxide, often found in first aid kits, can also double as a grout cleaner.

Carefully pour a small amount of hydrogen peroxide onto the grout lines.

Scrub with a sponge or brush to lift dirt and stains.

Rinse with water to ensure all the cleaning agent is removed.

White vinegar is not only effective in cleaning but also boasts antibacterial properties that can disinfect grout lines.

Soak a toothbrush in white vinegar and scrub it over the grout lines.

Create a 50-50 mixture of baking soda and water and spray it onto the grout. After waiting for about 10 minutes, scrub using a brush soaked in vinegar.

In both options, allow the vinegar to act for at least 10 minutes before rinsing thoroughly.

Clean grout lines can make a significant difference in the overall appearance of your floors. Using these natural methods, not only do you get sparkling grout, but you also ensure a chemical-free cleaning process. It might require some elbow grease and patience, especially for neglected grout, but the results are well worth the effort. Once cleaned, remember to rinse the entire floor to ensure no cleaning residues remain.