How to Clean Grout: A Guide

How to Clean Grout: Key Insights

• Acid-based cleaners like vinegar work well for targeted stain removal on cement grout, but regular use breaks down the grout matrix over time. For routine maintenance, stick to alkaline or neutral cleaners.
• Mould that returns within days of cleaning has likely penetrated below the grout surface. At that point, harder scrubbing won't help; the grout needs to be removed and replaced.
• Oil-based products like Murphy's Oil Soap and Pine-Sol leave a waxy residue inside grout pores that attracts more dirt. Use pH-neutral or alkaline cleaners instead.
• Sealing grout after a deep clean slows future staining, but only if the grout is completely dry first. Sealant applied too soon traps moisture underneath and can trigger mould growth.
• Professional grout cleaning often costs far less than regrouting and can restore surfaces that look well past saving.

In this guide, you'll read about:

1. How to Clean Grout: An Overview
2. What Leads to Grout Buildup
3. What You Need to Clean Grout Lines
4. How to Clean Tiles and Grout: Step-by-Step
5. Keeping Grout Cleaner for Longer
6. When to Call a Tiler
7. Find a Tiler on HomeStars
8. Frequently Asked Questions

How to Clean Grout: An Overview

Grout is a porous material, which is why it stains and discolours while the surrounding tile stays relatively clean. Most grout used in Canadian homes is cement-based, and its microscopic pores absorb whatever sits on or near them: water, soap, oils, and airborne particles.

There are two distinct approaches. Surface-level maintenance removes loose dirt and light deposits and can be done as part of regular tile cleaning. A deep clean targets buildup that has worked its way into the pores, whether that is soap scum, hard water deposits, or mould. How to clean tile grout effectively comes down to identifying the type of buildup before picking a method.

What Leads to Grout Buildup

Different areas of the home produce different types of staining, and the buildup in a shower is rarely the same as what collects on a kitchen floor.

Soap Scum and Hard Water Deposits

Bathroom grout around tubs and showers collects soap scum and mineral deposits from hard water. These leave a dull white or grey film that regular rinsing won't remove. In areas with hard water, including much of the Greater Toronto Area and parts of Alberta, this builds up faster than in softer-water municipalities.

Mould and Mildew

Shower grout stays damp for hours after use, which creates the right conditions for mould and mildew. Early mould appears as black or dark grey spotting. Left untreated, it works its way below the surface where surface cleaning can no longer reach it.

Grease and Food Residue

Kitchen tile grout, including backsplash areas above the stove, collects grease that bakes on over time. Unlike bathroom buildup, kitchen grease responds better to alkaline degreasers than to acidic cleaners.

General Dirt and Foot Traffic

Floor grout in entryways, hallways, and kitchens collects grime from shoes and regular use. This type of staining tends to discolour grout gradually and evenly across the floor rather than in concentrated spots.

What You Need to Clean Grout Lines

Most grout cleaning can be done with items many households already have. Having the right tools makes the process noticeably more effective.

Tools

• Stiff-bristled grout brush or old toothbrush: for scrubbing grout lines directly
• Spray bottle: for applying liquid cleaning solutions evenly
• Microfiber cloths: for wiping and drying after cleaning
• Bucket: for mixing solutions and rinsing
• Knee pads or a foam kneeler: useful for any large floor area

Cleaning Solutions

Cleaning solution	Best for
Baking soda paste (baking soda mixed with water)	General grime and soap scum
Baking soda and hydrogen peroxide paste	Yellowed or darkened grout
pH-neutral or alkaline commercial tile cleaner	Regular maintenance
Enzyme-based cleaner	Organic stains, mould, food residue
Diluted bleach (1 part bleach to 10 parts water)	Black mould on white or light grout only

What to Avoid

• Oil-based cleaning products (Murphy's Oil Soap, Pine-Sol, wax-based cleaners): leave a sticky film inside grout pores that attracts more dirt over time
• Acidic cleaners used repeatedly on cement grout (straight vinegar, citric acid): break down the grout matrix with repeated use
• Any acid on natural stone tile (marble, granite, travertine, slate): will permanently etch the surface

How to Clean Tiles and Grout: Step-by-Step

The general process is the same regardless of location: prepare the surface, apply the cleaner, allow it to work, scrub, rinse thoroughly, and dry. What changes is the cleaning solution and a few surface-specific steps.

How to Clean Floor Tile Grout

Move furniture and rugs out of the way, then sweep or vacuum to remove loose debris. Applying cleaner to a dusty floor just moves the dirt around.

• Apply your cleaner along the grout lines: let it sit for 5 to 15 minutes before scrubbing
• Scrub with a stiff brush: work in small sections from the farthest corner toward the exit
• Rinse with clean water: use a mop or sponge to remove all cleaner residue
• Dry thoroughly: water sitting in grout lines between cleanings accelerates future staining

Note: Knee pads make a real difference on large floor areas.

How to Clean Shower Grout

Shower grout requires slightly different handling because the surface is vertical and often dealing with mould or heavy soap scum.

• Wipe tiles and grout with hot water first: this loosens surface grime before the main cleaner goes on
• Apply a baking soda and hydrogen peroxide paste directly to the grout lines: leave for 10 to 20 minutes
• Scrub in short strokes with a stiff brush: pay extra attention to persistent dark spots
• Rinse thoroughly with warm water: dry the surface to prevent mould returning quickly

For persistent black mould spots: a diluted bleach solution (1 part bleach to 10 parts water) applied to white or light grout can help. Never mix bleach with vinegar or other cleaners. Rinse completely after use and ventilate the room well.

How to Clean Kitchen Tile Grout and Backsplashes

Kitchen grout collects grease and food residue rather than mineral deposits. An alkaline degreaser or a paste of baking soda and dish soap works better here than a vinegar-based solution.

• Apply the cleaner and leave for 5 to 10 minutes: grease needs more contact time than loose grime
• Scrub grout lines and wipe the tile surface together: the tile picks up cooking residue too
• Rinse with warm water and dry the area: repeat for baked-on grease around the stove

Avoid abrasive scrubbers that scratch glazed tiles.

Keeping Grout Cleaner for Longer

A few regular habits reduce how often a deep clean is needed.

• Wipe shower tiles and grout dry after use, or run the exhaust fan for at least 30 minutes: this removes residual moisture before mould gets a foothold
• Avoid mopping floors with an overly wet mop: water pooling in grout lines accelerates staining
• Clean kitchen grout spills quickly: grease and food residue are far easier to remove before they set
• Seal grout after a deep clean: a penetrating sealer adds a barrier that slows future staining without changing the appearance of the surface

Note: always let grout dry completely before applying sealer. Sealant applied to damp grout traps moisture underneath, which can cause mould.

When to Call a Tiler

Some grout problems go beyond what cleaning can address. These are the situations where bringing in a tiler is the right decision.

• Mould that returns within a week of cleaning: this indicates it has penetrated the grout structure and will keep coming back until the grout is removed
• Cracked, crumbling, or hollow-sounding grout: tapping the grout with a knuckle and hearing a hollow sound suggests it has separated from the substrate underneath
• Discolouration that doesn't lift after multiple attempts: some staining is permanent and the grout needs to be replaced
• Natural stone tile that requires specialist handling: granite, marble, travertine, and slate need acid-free products and specific methods that differ from standard cement grout care

A professional clean is also worth considering for large tiled areas needing a full restoration. For a sense of what professional tile work costs, see the tile installation cost guide and the tile and stone contractor cost guide on HomeStars.

Find a Tiler on HomeStars

If cleaning hasn't solved the problem, it may be time to bring in a tiler. HomeStars connects you with tilers near you so you can read reviews from other homeowners, compare options, and make an informed decision before anyone shows up at your door. Describe what you are dealing with and let interested pros come to you with assessments and quotes.

Find a local tiler for grout repair or replacement

Frequently Asked Questions

Can I use bleach to clean grout?

Bleach strips colour from pigmented grout and etches natural stone, so it is off the table for both. It also has no effect on epoxy grout, which is non-porous and doesn't absorb staining. Where it is used, treat it as a last resort rather than a routine cleaner; residual bleach left in cement grout accelerates degradation over time.

What is efflorescence and how do I remove it?

Efflorescence is the white, powdery residue that sometimes appears on grout and tile surfaces. It forms when moisture moves through cement-based grout, carrying soluble salts to the surface, which then crystallize as the water evaporates. It is not mould and is not harmful, but it does indicate moisture movement through the substrate. A targeted application of diluted white vinegar or a specialist efflorescence remover will dissolve the deposits on most cement grout; rinse thoroughly afterward and do not use vinegar on natural stone. If the deposits keep returning, there may be a more significant moisture source underneath the tiles, and a tiler can assess whether the installation or underlying waterproofing needs attention.

How often should I seal grout?

Most penetrating sealers last 1 to 3 years, but the actual lifespan depends on location. Shower and bathroom grout sees constant moisture and often needs resealing annually. Floor grout in low-traffic areas may hold for 2 to 3 years. The simplest way to test whether the sealer is still active is the water-drop test: drop a small amount of water on a dry grout line. If it beads up, the sealer is still working. If it absorbs into the grout within a minute or two, it is time to reseal. Always clean and fully dry the grout before applying a new coat.

Is steam cleaning effective for grout?

Steam cleaning uses pressurized steam to loosen and lift grime from grout pores without the need for chemical cleaners, which makes it particularly useful for mould and soap scum in showers and on bathroom floors. It reaches into the pores of cement grout more effectively than scrubbing alone and works well on surfaces where chemical cleaners are not suitable, such as near food preparation areas. Handheld steam cleaners are available at most hardware stores for rental or purchase. For larger floor areas, a professional-grade machine delivers much faster results, and tilers on HomeStars can carry out a professional steam clean as part of a broader tile maintenance service.

How often should grout be cleaned?

For floor grout in high-traffic areas, a quick wipe-down weekly and a deeper scrub monthly keeps staining manageable. Bathroom grout benefits from at least monthly treatment given constant moisture exposure, with a full deep clean two or three times a year. Kitchen grout near the stove, where grease builds up quickly, may need attention every two to four weeks. If grout starts looking noticeably darker between cleanings, that is usually a sign the sealer has worn off rather than a sign you need to scrub harder. If keeping up with grout maintenance is taking more time than you would like, tilers on HomeStars can do a full professional clean and seal in a single visit.