Mold on grout is one of the most common (and frustrating) issues homeowners face, especially in humid environments like bathrooms. While tile surfaces may be easy to clean, grout’s porous texture makes it a haven for mildew and mold. Left untreated, this buildup not only looks unsightly but may lead to serious concerns requiring mold remediation or even water damage restoration.

Whether you’re battling black spots on grout lines or a persistent musty smell, the following strategies can help. From natural cleaning methods to professional mold removal services, here’s your complete guide to banishing mold for good.

Scrubbing with Cleaning Products

Grab a scrub brush or an old toothbrush and choose from: Borax, Ammonia, Baking soda paste, or Commercial grout cleaners. A thorough scrub helps dislodge surface mold. For deeper infestations, you may need to follow up with mold cleanup products or even request a mold inspection to identify hidden sources.

Baking Soda Paste

Combine equal parts baking soda and water to create a thick paste. Apply the paste to moldy grout and allow it to sit for at least 10 minutes. Then scrub and rinse thoroughly. This natural cleaning method is an effective first step before considering commercial products or professional mold remediation.

Bleach or Hydrogen Peroxide

Use either oxygen bleach, chlorine bleach, or hydrogen peroxide—never in combination. Apply the solution to the affected grout, allow it to sit for several minutes, then scrub thoroughly. For persistent mold, apply bleach-soaked paper towels and leave them on overnight.

⚠️ Warning: Do not mix bleach with ammonia or other cleaners. Doing so can create hazardous, toxic fumes.

Steam Cleaning

A chemical-free solution, steam cleaning uses high-temperature vapor to kill mold and mildew in grout. This method is especially effective when paired with ongoing mold prevention practices.

Vinegar Soak

Soak a cloth in undiluted white vinegar and press it onto the moldy grout for several hours. The acidic vinegar loosens mildew and neutralizes mold odors.

Tea Tree Oil Spray

Add 10–15 drops of tea tree oil to a spray bottle filled with water. Shake well and spray directly onto moldy grout. Let it sit for at least one hour, then scrub clean. This natural remedy also leaves a pleasant scent.

Commercial Mold Removers

If DIY efforts fall short, turn to mold removal products designed specifically for grout. These professional-grade solutions target stains and offer long-lasting results.

Grout Sealing

Once your grout is clean, protect it! Apply a grout sealer to create a barrier against moisture. Reapply as needed to support long-term mold mitigation.

Grout Replacement

In extreme cases, old grout may need to be removed and replaced. This involves carefully scraping out damaged grout and applying fresh material.

Call a Professional Mold Removal Company

If mold keeps returning or has spread beyond grout lines, it’s time to contact a mold removal specialist. At PuroClean, our trained technicians offer mold assessment, mold cleaning, and complete home water damage restoration.

Mold on Grout: How to Prevent It

Boost Bathroom Ventilation

Moisture buildup is mold’s best friend. Fight back with proper airflow: Open windows when showering, run exhaust fans, or install a dehumidifier.

Daily Post-Shower Tips

Spray vinegar and water mix on grout lines, wipe down surfaces with a towel or squeegee, and clean grout regularly with mild cleaners.

Need Help With Mold on Grout? Contact PuroClean

At PuroClean, we know mold doesn’t just affect appearances—it can signal deeper water damage or hidden leaks. If DIY cleaning hasn’t worked, or if you notice recurring mildew, call your local mold removal company.

Contact PuroClean for Mold & Water Damage Help Today!

If you’ve noticed signs of mold growth or suspect that high humidity in your house is causing damage, don’t wait to take action. Contact PuroClean for professional mold remediation services. Our experts will assess the extent of the damage, safely remove the mold, and help restore your home to a healthy condition. Protect your property and your health—reach out to us today at (954) 546-9090 for reliable and thorough mold remediation.