To clean unsealed grout, mix the ammonia cleaning solution, apply to the grout, scrub, and remove with a wet vacuum. If stains or mold remain, rinse the area and air out the room before applying a bleach solution. Never mix ammonia and bleach, as a poisonous vapor results.Continue Reading
Pour 1/2-cup of baking soda into a spray bottle. Add 1/4-cup of white vinegar and 7 cups of water. Shake vigorously until the ingredients are mixed.
Spray the cleaning solution onto the grout. If the grout is heavily soiled, spray heavily and scrub with a stiff brush. Keep scrubbing until the grout is clean.
Use a wet vacuum to suck up the dirty solution. Wipe with a soft cloth to dry.
Inspect the grout for cleanliness. If the grout is still dirty or showing signs of mold or mildew, rinse off the areas.
Allow the grout to dry thoroughly, and air out the room of any ammonia fumes.
Mix one part of liquid chlorine bleach with five parts of warm water. Use a fresh bristle brush to apply the solution to the grout. Scrub with the brush.
After scrubbing, allow the bleach solution to sit for five minutes. Rinse the area completely. Do not follow with ammonia at any time.