How to Clean Grout Joints

This article provides general information on how to clean grout joints. It is typically easier to clean sealed grout joints because dirt and soap scum do not penetrate the grout. Unsealed grout joints may require a cleaning agent to loosen, lift, and remove contaminants.

The grout cleaning tips provided here may not apply to every situation. Use care when cleaning grout, especially when using cleaning products.

SAFETY WARNING If using cleaning agents, you should always have good ventilation. Simple masks will not protect you from noxious fumes. NEVER mix ammonia and bleach to clean your home or business.

Cleaning grout joints properly keeps tile looking fresh and helps prevent damage, odors, and health issues from mold and bacteria. Understanding the types of grout problems, cleaners, tools, and safety steps will make the job more effective and safer.

Common Types of Grout Problems

Grout is porous, making it susceptible to penetration by dirt, soap scum, grime, mineral deposits, etc. This leads to a dirty, stained look. The longer grout is left uncleaned, the harder it will be to clean. Timely maintenance is strongly advised. Typical grout contaminants are:

• Dirt and Grime: Tile is generally a low maintenance surface but dirt, grime, and airborne contaminants will always show up. From dirty hands to kitchen splatter, tile will require some level of maintenance.
• Soap Scum: In showers and tub areas, soap residues and personal care products can leave a residue that dulls tiles and penetrates grout.
• Lime Scale Deposits: Usually caused by hard water, mineral deposits (i.e., iron, calcium, magnesium) show as white, chalky buildup or reddish-brown discoloration.
• Mold and Mildew: Mold grows in constantly damp areas. Whether it’s humidity, lack of ventilation, or poor maintenance, organic issues can foul grout.

Types of Grout Cleaning Products

Choosing the right grout cleaning products depends on the type and severity of the staining. Common product categories include:

• Mild, pH‑neutral Cleaners: Best for normal maintenance and cleaning of tile and grout without etching or marring finishes.
• DIY Solutions: The internet is filled with home remedies for cleaning tile and grout. If you choose any of these option, always try it first on a small, inconspicuous area to confirm you will not damage tile, fixtures or hardware.
• Degreasers: Often necessary in tiled kitchens or commercial bathrooms, these products are handy to clean oils, grease, and petroleum-based products.
• Mold and mildew removers: Products with hydrogen peroxide or bleach specifically target mold and mildew in grout and can also brighten stains. *Be mindful of noxious fumes.

For any type of cleaning product, always follow manufacturers directions and use appropriate safety measures.

Types of Grout Cleaning Brushes

Physical action is necessary. Grout cleaners work best when applied with brushed, pads, or sponges. Stiff bristle brushes are the most common cleaning tool. Useful types of brushes are:

• Narrow Brushes: Stiff‑bristled, narrow brushes are good for working directly into thin grout joints..
• Toothbrush‑style Sized Brushes: Small brushes are ideal for cleaning inside corners and around fixtures or hardware.
• Stiff‑bristle Scrub Brushes: For deep contaminant problems bristle brushes provide a more aggressive way to clean grout joints.
• Pads and Sponges: For light maintenance, cleaning pads and spongs are the easy way to remove thin residue.
• Steam Cleaners: Often preferred for commercial cleaning, high‑temperature steam can remove stubborn contaminants and kill microorganisms without using chemicals.

Step‑By‑Step Basic Cleaning Process

Here is a general safe cleaning process for light to moderate dirt, grime, and soap scum:

1. Apply: Apply your grout cleaning product to joints. Allow it to site per manufacturers recommendations.
2. Scrub: Scrub grout joints with a stiff-bristle brush to facilitate penetrating grout with cleaning agent and lossening contaminants.
3. Rinse: Rinse thoroughly with clean water to wash away contaminants.
4. Seal Grout: Allow the grout to fully dry. Apply a grout sealer per manufacturers recommended methods (Not required frequently). Wipe away any grout sealer which may be on tile, tubs, shower doors, or hardware.

Risks and Potential Damage When Cleaning Grout

Improper cleaning can damage grout, tile, and indoor air quality. Key risks include:
• Grout erosion: Overuse of strong acids, harsh abrasives, or aggressive wire brushes can wear away grout, leading to cracks and gaps.
• Tile damage: Acidic cleaners can etch or dull natural stone and some glazed tiles, and abrasive pads may scratch delicate surfaces.
• Residue build‑up: If cleaners (especially bleach, ammonia, or acid‑based products) are not thoroughly rinsed, they can leave films that attract more dirt and may release volatile organic compounds (VOCs) over time.
• Health effects: Moldy grout and trapped chemical residues contribute to poor indoor air quality and may aggravate asthma, allergies, and respiratory symptoms.

Always test strong cleaners on a small, inconspicuous area first to check for color loss, etching, or other adverse reactions.

Protecting Adjacent Surfaces from Harsh Products

Harsh or specialized cleaners that work well on grout can damage nearby surfaces if they are unprotected. To safeguard the rest of the area:

• Mask-off Areas: Use painter’s tape or plastic sheeting to protect hardware, glass, fixtures, and natural stone from harsh chemical reactions.
• Control Application: Apply cleaners directly into grout joints using squeeze bottles, narrow nozzles, or small brushes rather than spraying broadly over the entire surface.
• Clean Up Spills: Immediately wipe any cleaner that touches sensitive surfaces with clean water and a soft cloth.
• Use appropriate cleaners for tile type: If you have marble, limestone, avoid acidic grout cleaners.

Safety Considerations and Ventilation (Fumes and Exposure)

Both dirty grout and cleaning chemicals present health and safety concerns, especially in enclosed bathrooms.

• Chemical Exposure: Strong cleaners, including bleach, ammonia, and other harsh products, can release noxious fumes. Read and follow warning labels on all products.
• Mold / Mildew: Mold and mildew can release spores known to cause health problems. This is especially true of black mold health risks.
• Ventilation: Fresh air is paramount. Ensure good air turnover by utilizing exhaust fans. When available, open windows and doors.
• Safety Equipment: Wear chemical‑resistant gloves, and possibly eye-protection to protect from chemical-related injury.

Summary and Takeaways

If you have hired a professional tile contractor be sure to ask for their input on tile and grout maintenance. Leverage their experience to keep your tile work in peak shape.

Have you purchased a property with tile that needs to be cleaned? You can try it yourself using the tips we’ve provided. If you don’t get the results you want, try to locate a nearby grout cleaning service. For a commercial business, you should definitely hire a commercial cleaning company, especially if you need hygienic cleaning.