How do you fix old moldy grout?

Author: Dr. Lindsey Hessel II  |  Last update: Friday, July 10, 2026

Vinegar's acidic property makes it an effective solution in combating mold. Fill a spray bottle with undiluted white vinegar and apply it directly on the moldy grout. Give it an hour or so to work its magic then scrub with a grout brush. Rinse with warm water and dry with a clean cloth.

How to restore moldy grout?

Opt for household staples like borax, ammonia, baking soda paste, or commercial grout cleaners. The vigorous scrubbing action helps dislodge the mold on grout. Baking Soda Paste: For a natural and eco-friendly approach, concoct a paste using equal parts water and baking soda.

What is the best product for moldy grout?

Straight up distilled white vinegar kills about 80% of mold and you don't have to worry about it going bad like hydrogen peroxide. I keep a spray bottle in my bath and just spray down the grout afterwards. The vinegar smells dissipates fairly quickly.

How do you rejuvenate old grout?

Start by sprinkling baking soda liberally along the grout lines. Use a brush to ensure that most of the baking soda covers the dirt and grime thoroughly. Then use a sprinkler bottle to sprinkle cleaning vinegar over the baking soda while taking special care to dampen the powder along the entire grout line.

How to clean grout that has turned black?

To clean black grout, mix water and white vinegar. Then rub the solution on the grout using a toothbrush and let it sit for a few minutes before rinsing. You can also use a mixture of water, baking soda and dish detergent. But don't use bleach or hydrogen peroxide excessively as they cause discoloration.

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How do you get rid of black mould from grouting?

Simply mix together half a cup of baking soda with four teaspoons of water until it forms a spreadable paste. Apply this paste directly to areas of mouldy grout and let it sit for 15 minutes. Finally, scrub the mould away with an old toothbrush and rinse with warm water.

What is the best thing to clean old grout with?

Use Dish Soap Solution

Your dish soap can do the magic in cleaning grouts along with the dishes. You have to add dish soap to water and make a solution, then mop the floor or wall with a microfiber cloth/mop as per your convenience.

What do professionals use to clean grout?

Some professionals swear by a simple mixture of baking soda and peroxide to clean grout. Hydrogen peroxide is an acid, and baking soda is a base compound. Mixing the two together creates a reaction that can penetrate the grout lines and free dirt and debris.

What is the best mold remover for grout?

Our Top Picks
  • Best Overall: Black Diamond Ultimate Grout Cleaner Spray for Tile with Brush at Amazon $37. ...
  • Best Budget: SALE. ...
  • Best for Showers: Scrubbing Bubbles Grime Fighter Spray at Amazon $8. ...
  • Best for Mold and Mildew: Home Armor Instant Mold and Mildew Stain Remover at Amazon $17. ...
  • Best Scent: ...
  • Best Brush:

Is OxiClean safe for grout?

If you're trying to clean grimy grout between your bathroom shower or floor tiles, then OxiClean™ bathroom cleaners are here to help! They get rid of grout stains on vertical and floor tiles for a refreshed bathroom.

Will a magic eraser remove mold on grout?

It's a great short-term fix, but it's not actually going to make your walls, floors, or backsplash any cleaner. Magic erasers are a fantastic way to get grout very clean, very quickly. The downside is, the grout will rip through your magic erasers in a hurry.

What is the difference between mildew and mold?

Mildew has a gray, white or light brown color and generally rests flat on the surface of a moist area. It has a powdery appearance that may have a distinct, foul odor. Mold has a fuzzy, raised appearance and in unaired areas has a strong, musty smell. It often appears in darker shades of black, green and red.

Can you paint over moldy grout?

DON'T ignore mildew or mold

Grout paint is top-notch at hiding discolored and dingy grout, but it shouldn't be applied over mold or mildew. Spray a heavy-duty mold killer to KO any fungus before you paint.

Is it OK to put new grout over old grout?

You can apply new grout right over the top of the old grout. To do this, all you need is a grout removal tool. Use the tool to strike out the old grout, making sure the depth is at least 2mm, which is about the thickness of two dimes stacked one on top of the other.

Can you fix bad grouting?

If you've tried cleaning your grout and restoring it with a grout pen, but you're still unhappy with the look of the grout, the other option is to remove it and replace it with new grout. Check out our video with advice for re-grouting tiles.

Do grout rakes work?

A dedicated grout rake or a Stanley blade is best for removing existing grout. Grout rakes can be both mechanical and electric. Any electric grout rake is usually 240V and has variable speeds. The Rubi Grout Remover helps to remove grout surrounding ceramic and porcelain tiles.

How to clean moldy grout?

Vinegar's acidic property makes it an effective solution in combating mold. Fill a spray bottle with undiluted white vinegar and apply it directly on the moldy grout. Give it an hour or so to work its magic then scrub with a grout brush. Rinse with warm water and dry with a clean cloth.

What is the lifespan of grout?

There are a number of factors that can cause cracks and issues in the grout. But if cared for properly, grout can last for up to twenty years.

Does the pink stuff clean grout?

How it works: Touted as a miracle cleaning paste, The Pink Stuff is easy to apply to grout using a soft cloth or sponge. Simply rub and scrub, and then rinse with hot water. As a mildly abrasive cleaner, the paste has a little grit to it, which helps scrub away dirt and debris from grout and surfaces.

Are grout pens any good?

Grout pens will only temporarily cover your grout's discoloration. That's probably why they are the cheapest option available. We run into the infamous grout pen issue nearly every other week. The project usually goes awry when the homeowner applies the grout pen to the grout and some bleeds over onto the tile.

Can toothpaste whiten tile grout?

Try using just plain old toothpaste and apply a dollop to a damp cloth. Next, pat down the grout gently and let it sit like that for a few hours. Finally, wipe away what's left of the toothpaste, and voilà, your grouts should be squeaky clean and white.

What is the best DIY grout whitener?

If you prefer cleaning grout with a DIY mixture, make a paste of 3/4-cup baking soda, 1/4-cup hydrogen peroxide and 1 tablespoon of mild dish soap. Apply the paste to the grout with a grout brush and scrub the grout.

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