Sweep or vacuum the tiled area
Mix warm water with a small amount of dish soap
Apply the solution to the grout
Scrub the grout with a stiff brush or toothbrush
Rinse with clean water
Make a paste of baking soda and water for stubborn stains
Apply the paste to the grout
Spray or pour vinegar over the paste if needed
Scrub again
Rinse thoroughly
Dry the area with a clean cloth
Use a grout cleaner for heavy buildup
Repeat as needed
Seal the grout after it is completely dry