The Ultimate Guide to Cleaning Grout - Transform Your Tile Floor in 3 Simple Steps
Introduction
It's easy for grout between tiles to become stained and discolored over time, appearing dingy and dirty. This makes the entire floor look old and unclean, even if the tile itself is in fine shape. Learning how to properly clean grout helps refresh the appearance of the floor, making the room look brighter and more inviting. Keeping grout clean also serves an important practical purpose. As grout gets dirty, it provides more places for mold, mildew and bacteria to take hold. Clean grout improves the hygiene of the floor.
With some basic supplies and techniques, you can efficiently clean the grout throughout your home. The process does take some elbow grease, but the results are worth it. Your floor will look like new again. Grout cleaning also extends the lifespan of the grout and tiles by removing debris that can deteriorate the materials.

Assess the Current Condition of the Grout
Before cleaning grout, it's important to assess the current condition in order to determine the best cleaning method. Carefully inspect the grout lines for any discoloration, staining, or growth of mold and mildew.
Look for:
- Discoloration - This is often caused by dirt buildup over time. Grout can turn from white to dark gray or black
- Staining - Spills and drips can leave behind stubborn stains. Coffee, tea, juice and other liquids may stain the grout.
- Mold and mildew - Damp conditions allow mold and mildew to grow, leaving behind black or green spots. This is common in bathrooms and kitchens.
- Cracks - Grout can develop hairline cracks from normal wear and tear. Larger cracks may indicate underlying issues.
- Missing grout - Grout can deteriorate and fall out over time, leaving empty joints between tiles.
- Powdery grout - Extremely dirty grout may turn powdery and rub off easily when touched.
Take note of the overall condition of the grout. Light dirt may require only a mild cleaner, while heavy grime buildup or staining may need a more potent solution and extra scrubbing. Identifying any existing mold or mildew growth is also important before disinfecting and cleaning the grout.
Types of Grout Cleaning Solutions
There are several common household ingredients and store-bought cleaners that can be used to effectively clean grout.
Vinegar
Vinegar is a mild acid that can help dissolve dirt, grime, and hard water deposits that build up in grout over time. White distilled vinegar or apple cider vinegar work best. Always test vinegar in an inconspicuous area first, as acidic cleaners can damage some grout.
Mix equal parts vinegar and water in a spray bottle. Spray the solution onto the grout and let sit for 5-10 minutes before scrubbing with a stiff grout brush. Rinse thoroughly. Vinegar can leave behind a lingering odor, so make sure the area is well ventilated.
Baking Soda
For tougher stains, make a thick paste with baking soda and just enough water to form a spreadable consistency. Apply the paste to grout with an old toothbrush or other soft brush. Let sit for 5 minutes before scrubbing. Baking soda acts as a gentle abrasive to lift away dirt. Rinse thoroughly after scrubbing.
Hydrogen Peroxide
Hydrogen peroxide is another common household ingredient that can be used as a grout cleaner. Mix equal parts hydrogen peroxide and water in a spray bottle. Lightly spritz on grout lines and let bubble for 2-3 minutes. The oxygen in hydrogen peroxide can help lift stains. Scrub and rinse thoroughly after application.
Commercial Grout Cleaners
There are many store-bought grout cleaners available. Look for options specifically marketed for cleaning and whitening grout. Follow the product instructions closely. Some cleaners can simply be sprayed on and wiped off, while others require letting the product sit before scrubbing and rinsing. Only use commercial cleaners formulated for grout and tile. Avoid harsh chemicals like bleach that may degrade and damage the grout over time.
Prepare the Area
Before applying any cleaning solutions, you'll want to prepare the area to avoid damaging nearby surfaces or furnishings. Here are the steps:
- Remove any furniture, rugs, or other items that are sitting on or near the tiled floor. This protects them from getting wet or coming into contact with the cleaning solutions. Set items aside in another room if possible.
- Sweep the floor with a broom to remove any loose dirt or debris. This prevents abrasive particles from scratching the tile or grout when scrubbing. Pick up and discard any larger pieces of debris as well.
- Lay down old towels around the perimeter of the area to be cleaned. This will absorb any excess moisture and prevent the cleaning solutions from spreading beyond the intended space. Open any nearby windows or doors to promote air circulation and allow the area to dry faster after cleaning.
- Wear gloves and knee pads to protect your skin and joints while scrubbing. Make sure the area is well-ventilated.
- Mix your cleaning solutions in a separate container first before applying to the grout lines. Have a mop bucket ready to rinse tools after use.
Apply the Cleaning Solution
Applying the cleaning solution is a key step in the grout cleaning process. Be sure to take the time to apply the solution thoroughly and evenly across all grout lines.
There are two main methods for applying grout cleaner:
Use a Brush
Using a scrub brush allows you to work the cleaning solution deep into the grout. Dip the brush into the grout cleaner and scrub it vigorously back and forth across the grout lines. Apply pressure to get the bristles down into the pores of the grout. Re-dip the brush frequently as you work across the entire floor. Focus on problem areas with extra scrubbing to penetrate built-up dirt and stains.
Use a Spray Bottle
For large tile floors, using a spray bottle to apply the cleaner can save time and effort. Spray the solution liberally over sections of the floor and grout lines. Avoid just a light misting—you want the grout fully saturated. Work in manageable sections of 3-4 tiles and reapply as needed as you scrub.
Once the cleaning solution has been applied thoroughly with either a brush or spray, let it sit for 5-10 minutes. This dwell time allows the active ingredients to break down grime and lift dirt from the grout. Don't let the solution dry; reapply if needed.
Scrub the Grout
Once you've applied the cleaning solution, it's time to start scrubbing. This is the real work that will get your grout looking clean again.
You'll want to use a tool that can get down into the grout lines to scrub away any built-up dirt, grime, mold, or mildew. A grout brush is ideal for this task. Grout brushes have stiff bristles in a thin shape that can get into the crevices. Look for ones with a handle so you can apply plenty of pressure.
If you don't have a grout brush, don't worry. You can also use an old toothbrush for scrubbing grout. Toothbrushes are inexpensive and easy to find. Just make sure it has sturdy bristles. The small size allows you to precisely scrub along the grout lines.
Apply plenty of muscle into the scrubbing motion. You may need to scrub for several minutes to fully lift up the grime from deep down in the pores of the grout. Be patient and keep scrubbing until the grout lines look clean.
Scrubbing is the most important step for getting dingy, dirty grout to look bright and new again. Don't rush through this part. Take your time and thoroughly scrub every inch of the grout lines.
Rinse Thoroughly
It's crucial to rinse the grout thoroughly after scrubbing to remove all residue from the cleaning solution. Any leftover residue can lead to hazing or discoloration of the grout over time.
Use clean, warm water and rinse the entire area you cleaned. You may need to rinse multiple times to ensure you've removed all traces of the cleaning solution. Pay close attention to corners and crevices where residue can easily get trapped
After rinsing, inspect the grout lines closely. Look for any suds or haze from the cleaning solution. Re-rinse any problem spots.
You may find it helpful to use a soft cloth or sponge to wipe the grout lines while rinsing. This extra step helps lift out stubborn residue. Just be gentle and don't scrub anymore.
Keep rinsing and inspecting until all visible residue is gone. The grout lines should look clean without any suds, film or discoloration.
Proper rinsing is a critical step for achieving clean grout. Make sure to dedicate enough time to thoroughly remove all traces of the cleaning solution.
Allow Grout to Dry
After thoroughly rinsing away the cleaning solution, it's important to give the grout adequate time to dry completely before sealing or using the surface. Here are some tips for proper drying:
- Let the grout air dry naturally. This usually takes at least 24 hours. Avoid wiping, as this can smear the grout before it has fully cured.
- For faster drying, use fans to actively circulate air across the grout lines. Position fans directly over the tile floor and leave them on for several hours. The increased airflow will speed up the drying process.
- Check for dampness before sealing or using the surface. Grout needs to be completely dry for the sealant to work properly. Try wiping a small area with a dry cloth - if it comes up clean, the grout is ready. If any residue comes up, allow more drying time.
- Be patient and allow at least 24 hours of drying time for water-based grout cleaning solutions. This ensures all moisture has completely evaporated so the grout won't get mildew.
- It's better to wait and let the grout dry thoroughly than rush ahead before it's ready. Taking the extra time will ensure your hard cleaning work and freshly grouted floor lasts.
Seal the Grout
Sealing the grout after cleaning is an important step to help protect it from future stains. When unsealed, the porous nature of grout allows it to easily absorb liquids, dirt, grime, and bacteria over time. Sealing forms an invisible barrier that repels these contaminants.
There are several benefits to sealing grout:
- Protects against stains - Sealer fills in the pores and creates a waterproof barrier to prevent absorption of spills and dirt. This makes the grout much easier to clean.
- Inhibits mold and mildew growth - Grout is prone to growing mold and mildew in moist environments like bathrooms. Sealing grout helps prevent moisture from being absorbed, inhibiting mold and mildew growth.
- Maintains a clean appearance - Sealed grout resists absorbing dirt and remains cleaner looking for longer vs unsealed grout.
- Extends the life of grout - By protecting grout from damage and wear, sealing can help grout last longer before needing repairs.
- Allows for easier cleaning - Spills and dirt wipe up more easily from sealed grout vs unsealed. Less scrubbing is required.
- Enhances color - Sealer can help enhance grout color and make it look more vibrant.
Be sure to use a sealer compatible with your specific grout type, whether it's epoxy-based, cementitious or urethane grout. Water-based silicone sealers work well for cement grout. Follow the product instructions for proper application and drying time. Re-apply sealer every 1-2 years for best results. Keeping grout sealed is a simple way to protect its appearance and lifespan.
Maintain the Grout
Once the grout between your tiles is cleaned, sealed, and looking new again, you'll want to keep it that way with basic maintenance. Here are some tips:
Clean on a regular basis. It's much easier to maintain clean grout than to scrub stained or soiled grout. Sweep and mop tile floors weekly using a tile cleaning product diluted with water. This helps prevent dirt and grime from building up.
Re-seal every 1-2 years. While sealing grout provides protection, it does wear off over time. Check the condition of your grout sealant annually. Reapply a penetrating grout sealer if you notice the grout looking dingy again or water not beading up on the surface. Re-sealing will refresh that protective barrier.
Following a regular cleaning routine and re-sealing grout on a periodic basis will help keep your grout looking like new for years to come. Proper maintenance prevents having to do heavy-duty grout cleaning too often.
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