How to clean grout between glass block using a scrubber

Last updated: November 12, 2026 8:00:00 AM

Apply a mild cleaning solution directly to the stained grout lines between your glass blocks. Scrub the mixture gently with a handheld tool until the buildup disappears, then rinse the area thoroughly with clean water.

To clean grout between glass block using a scrubber, New York Giants Ticket Account Manager | New York Giants you need to apply a safe cleaning solution to break down soap scum or mildew, and then scrub the joints gently with a stiff-bristled pad to lift the grime. Glass block walls add a stunning architectural element to bathrooms, basements, and entryways, but the mortar and grout lines holding them together inevitably collect dust, moisture, soap residue, and mold over time. Because glass blocks are smooth and durable, the real challenge lies in restoring the recessed mortar joints without scratching the surrounding glass or eroding the binding material.

Preparing the Workspace

Before touching any cleaner to the wall, clear away all personal items, bath products, and decor resting near the glass blocks. Lay down thick towels or a plastic drop cloth at the base of the wall to catch any dripping cleaning solution, loosened debris, and dirty water. Protect your floors and surrounding woodwork, as certain cleaning agents can discolor wood finishes or stain carpets.

Next, remove loose surface dust and loose particles. Take a dry microfiber cloth or a soft-bristled hand broom and wipe down the entire glass block assembly. Pay close attention to the corners and crevices where the blocks meet the mortar. Eliminating this top layer of loose dust prevents it from turning into a muddy paste once you apply liquid, which would only make the cleaning process harder and push dirt deeper into the porous grout.

Ventilate the area thoroughly by opening nearby windows and running an exhaust fan if you are working in an interior bathroom. Cleaning agents, even mild ones, can produce fumes or strong odors in confined spaces. Wear rubber gloves to protect your hands from drying agents and safety glasses to shield your eyes from accidental splatters, especially when working on overhead joints.

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Fill a bucket with warm water and add a few drops of mild dish soap to create a gentle base solution for general dirt and grime. For standard maintenance, this soapy water is enough to loosen light oils and everyday buildup without harming the mortar.

If the grout between the glass blocks shows signs of mold, mildew, or stubborn yellowing, you will need a stronger mixture. Combine equal parts white vinegar and warm water in a spray bottle. Vinegar is acidic enough to cut through soap scum and kill mold spores without being abrasive enough to dissolve standard mortar when rinsed properly.

For severe discoloration or dark staining that resists vinegar, create a thick paste by mixing baking soda with small amounts of hydrogen peroxide in a separate small bowl. Stir the mixture until it reaches the consistency of smooth toothpaste. Baking soda provides a mild abrasive quality that helps scour away embedded dirt, while hydrogen peroxide acts as a brightener to lift stubborn dark spots safely. Avoid using harsh chemical bleaches or abrasive scouring powders, as these can weaken the mortar joints over time and emit overwhelming fumes.

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Begin at the top of the glass block wall and work your way down. This prevents dirty runoff from streaking areas you have already cleaned. If you are using the liquid vinegar spray or soapy water, mist the surface generously, ensuring the liquid pools slightly within the recessed grout lines. Let the liquid sit undisturbed for several minutes. This dwell time allows the cleaner to penetrate the porous surface of the mortar and break the bond holding the dirt and mildew in place.

If you opted for the baking soda paste to tackle heavy stains, use a small spoon or a gloved finger to smear the paste directly into the grout lines between the glass blocks. Press the paste firmly into the crevices so it makes full contact with the discolored mortar. Allow this paste to rest on the wall for ten to fifteen minutes. During this waiting period, the paste will bubble slightly and lift embedded grime to the surface.

Scrubbing the Grout Lines

Take your scrubber and test it gently against a small, inconspicuous section of the glass and mortar to ensure the texture does not scratch the glass. Hold the scrubber firmly, placing your thumb or fingers behind the scrubbing surface for maximum control. Fit the edge of the scrubber directly into the channel of the grout line.

Move the scrubber in firm, small circular motions along the mortar joints. Apply moderate pressure, allowing the texture of the scrubber to do the work of lifting the loosened grime. For tighter intersections where four blocks meet, turn the scrubber on its edge to target the corners effectively. Do not press with excessive force, as aggressive scrubbing can chip the edges of the glass blocks or disintegrate fragile, aging mortar.

As you scrub, you will notice the cleaning solution turning grey or brown as it suspends the lifted dirt. Work systematically from the top left corner across and down, treating one section at a time until every grout line has been thoroughly agitated. For stubborn spots that refuse to budge, dab a little extra cleaning solution onto the area and repeat the circular scrubbing motion.

Rinsing the Surface

Fill a separate bucket with clean, lukewarm water. Dip a large, clean sponge or cloth into the water, wring it out slightly so it does not drip excessively, and wipe down the entire glass block wall. Start again from the top and work downward, removing all traces of soap, vinegar, baking soda paste, and dislodged dirt.

Rinse your sponge frequently in the clean water bucket. If the rinse water becomes murky, empty the bucket and refill it with fresh water. Leaving cleaning residue behind on the glass blocks will create an unsightly film once the wall dries, and residual baking soda or soap in the grout can actually attract new dust and grime more quickly.

Check your work by shining a flashlight or looking at the wall from an angle under natural light. If you spot any remaining hazy patches on the glass or dark spots in the grout, dab a little more cleaner on those specific areas, scrub lightly, and ri Nov 12, 2026 · We tested 26 of the best electric scrubbers on the market, and narrowed them down to the six best. These are the ones we liked most for their ease of use … nse again.

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Take a clean, dry lint-free cloth or a dry microfiber towel and dry the glass blocks and surrounding mortar. Wiping the surface dry prevents water spots from forming as the remaining moisture evaporates.

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Once the wall is completely dry, take a fresh microfiber cloth and buff the glass blocks in broad circular motions. This final step polishes the glass to a clear, streak-free finish, highlighting the clean, refreshed grout lines and restoring the bright, luminous appearance of the entire glass block installation.