To remove mold from grout, use natural options like a baking soda and hydrogen peroxide paste or white vinegar for lighter mold, or bleach solutions for stubborn stains, applying the cleaner, letting it sit, then scrubbing with a stiff brush (like a toothbrush) and rinsing thoroughly, ensuring good ventilation and wearing gloves. For deep mold, bleach-soaked paper towels left overnight or commercial cleaners can work, but always rinse well and consider sealing the grout after to prevent recurrence.
How to get rid of grout mould
Bleach is the most effective method for removing mold from shower grout. Method One: Make a solution of one-part bleach and four-parts water, and put it in a spray bottle. Spray the affected area and scrub with a brush after 30 minutes. Rinse with water and repeat if necessary.
To remove the mould, complete the following:
Vinegar is generally better for killing mold on porous surfaces because it penetrates roots and prevents regrowth, while bleach is better for non-porous surfaces (like tile) where it kills surface mold but doesn't stop roots and can damage porous materials; however, for large mold issues, professionals are recommended as both have limitations and bleach releases toxic fumes, making vinegar safer.
However, because it is a mild acid, avoid using vinegar on aluminum, cast iron, waxed wood, or natural stone, as it may damage or cause etching in the finish.
Can hydrogen peroxide remove mold from grout? Yes. Its oxidizing properties kill mold spores and lift stains effectively—especially in humid environments like Atlanta bathrooms.
Can I just spray vinegar on the mold and leave it? You can spray vinegar on mold and leave it, but you'll have to scrub and rinse the area after about an hour.
Rentokil Specialist Hygiene's Mould Removal Service will thoroughly clean and disinfect all surfaces affected by mould issues, helping to prevent mould from reappearing. Our specialist two part Mould Removal Service uses a Mould Eliminator to treat and clean away, and a Mould Sanitiser to prevent regrowth.
Cleaning Agents: Bleach, hydrogen peroxide, white vinegar, baking soda, or commercial mold removers. Scrubbing Tools: Old toothbrush, scrub brush, or a sponge. Caulking Tools: Silicone caulk and caulking gun for resealing after cleaning.
Professionals use a multi-stage approach for cleaning grout, combining alkaline degreasers, steam cleaning, and high-pressure hot water extraction for deep cleaning, often using specialized brushes and sometimes acid washes for tough stains, plus tools like grout brushes, microfiber cloths, and sometimes powerful machine scrubbers for large areas, always ending with thorough rinsing and drying. They might also use oxygen bleach for brightening or specific grout cleaning powders for tough discoloration.
Common Causes of Blackened Grout
Grout doesn't turn black overnight. Dirt, mould, and moisture build up gradually, darkening the once-bright lines between your tiles. One of the main culprits is excess moisture, which creates the perfect environment for mould and mildew.
Vinegar's acidic properties kill most types of mold effectively. Hydrogen Peroxide: For tougher mold, mix three parts water with one part hydrogen peroxide. Spray the solution and allow it to sit for 10-15 minutes before scrubbing. Baking Soda: Dissolve 1 teaspoon of baking soda in 2 cups of water.
Oxygen Bleach, Chlorine Bleach, or Hydrogen Peroxide: Stubborn mildew stains call for more potent solutions. Spray the affected grout with oxygen bleach, chlorine bleach, or hydrogen peroxide, ensuring the solution saturates the stains. Let it dwell for several minutes, then scrub the area.
This type of mold, often appearing as dark black or green patches, can cause respiratory problems, trigger allergies, and even damage surfaces over time. The constant moisture from showers creates the perfect environment for mold to grow, making it essential to address the problem immediately.
Dubbed as one of the more 'natural remedies' for mould removal, baking soda has been used as cure for black mould outbreaks for generations. Many people still swear by it.
Don't Use Inadequate Equipment
What you have to do is drain all the water from bath tub, turn on the bathroom fan and close/shut the door completely and just leave it every time after you take the bath. Believe or not you won't have molds.
Symptoms caused by a mold allergy can include:
RMR-86 is a unique spray cleaner formulated to break apart these tough stains in seconds. The fast-acting, ready-to-use formula goes below the surface to break apart stains in just 15 seconds with no mixing, sanding, or scrubbing required.
Baking soda is milder than vinegar and may not work on more aggressive forms of mold. It does, however, have the added benefit of absorbing odors and any remaining residue can help prevent the mold from recurring.
The main difference between cleaning vinegar and white vinegar is acetic acid concentration: white vinegar (food grade) is typically 5% acid, safe for cooking and cleaning, while cleaning vinegar has a stronger 6% (or more) acidity, making it about 20% more powerful for tough grime but unsafe for consumption. You can use white vinegar for most tasks, but for heavier-duty cleaning, the extra acid in cleaning vinegar cuts through buildup better, though you must not use it on natural stone, hardwood, or mix with bleach.
Bleach, ammonia, and cleaners with these harsh chemicals added in can cause grout to yellow, fade, or become discolored. They can also degrade the grout and cause it to erode over time.
Both vinegar and hydrogen peroxide are great for killing mold, but they work differently. Vinegar is better for porous surfaces like wood or drywall because it penetrates deep to kill mold at the root. On the other hand, hydrogen peroxide is great for non-porous surfaces like tiles or countertops.
Let sit for 5-10 minutes (the longer, the better). Scrub with a toothbrush, grout brush, or scrub brush. Rinse or wipe off with a microfiber cloth to remove dirt, mold, mildew, and grime.