How to Clean a Brick Fireplace: Soot, Stains and Brick, Step by Step

Learning how to clean brick fireplace surfaces the right way makes a surprising difference. A soot-blackened fireplace can make a whole living room look tired, even when the rest of the room is clean. Most brick fireplaces do not need harsh chemicals or a professional visit to look much better.

What You Need to Clean a Brick Fireplace

Gather everything before you start. Brick is porous, so once soot is wet and spread around, it is much harder to remove. Having your tools ready keeps the job quick and stops you from reaching for the wrong cleaner halfway through.

• A stiff nylon-bristle brush and an old toothbrush for mortar joints
• A vacuum cleaner with a brush attachment, or a small ash vacuum
• A dry chemical cleaning sponge, also called a soot sponge
• Rubber gloves, safety glasses and an N95 or similar dust mask
• Old towels, a drop cloth and a metal ash bucket with a lid
• Two buckets, clean rags, a spray bottle and a grout brush
• Dish soap, white vinegar, baking soda and, only for heavy soot, trisodium phosphate (TSP)

Safety First: Cold Ashes and Ventilation

Never clean a fireplace that is warm. Wait at least 24 to 48 hours after the last fire, and check the ashes with the back of your hand before you touch them. Ashes can hide hot embers for days, and a hot ember in a bin or a vacuum bag is a fire risk. Scoop cold ashes into a metal bucket with a tight lid and store it outside, away from the house.

Open a window or a door for fresh air, and open the damper if your fireplace has one. Soot is fine, dusty and irritating, so wear gloves, glasses and a mask while you brush and vacuum. If you use TSP, read the label first and wear gloves and eye protection. Never mix cleaning products, especially bleach with vinegar.

Start With Dry Cleaning: Vacuum and Brush the Soot Away

Dry cleaning first is the step most people skip, and it is the step that matters most. Brick soaks up water, and wet soot turns into a grey smear that sinks into the surface. Removing as much loose soot as possible while it is dry gives every cleaner that follows a much better chance.

Start at the top and work down, so dust falls onto areas you have not cleaned yet. Vacuum the brick face, the mortar joints, the hearth and the firebox with a brush attachment, using light strokes. Then brush the brick firmly with a dry nylon brush and vacuum the loosened soot as you go. Next, wipe the brick with a dry chemical sponge, which lifts smoke residue without water.

Cleaning Solutions Compared: Dish Soap, TSP, Vinegar and Baking Soda

There is no single best cleaner for every brick fireplace. The right choice depends on how heavy the soot is and how old the brick is. Start with the gentlest option that could work, test it on a small, hidden patch, and move up only if the soot stays put.

Cleaner	Best for	Strength	Watch out for
Dish soap	Light soot and general dirt	Gentle	Needs rinsing; weak on old stains
Vinegar solution	Light to medium soot and odour	Mild	Can lighten some mortar; rinse well
Baking-soda paste	Medium soot and spot stains	Medium	Needs dwell time; gritty if not rinsed
TSP solution	Heavy, old soot	Strong	Harsh; gloves, ventilation and care needed

Dish soap is the safest first step. Mix a few drops of plain dish soap in a bucket of warm water. It cuts greasy soot without bleaching brick or mortar, and it suits painted brick, newer brick and fireplaces you clean often. Its weakness is heavy, baked-on soot, which it will lighten but rarely remove on its own.

Vinegar suits light to medium soot and helps with the smoky smell. Mix equal parts white vinegar and warm water in a spray bottle, spray a small area, leave it for five to ten minutes, then scrub and rinse. Do not use vinegar on marble or limestone surrounds, and do not mix it with baking soda in the same step.

Baking-soda paste is best for spot stains and medium soot. Mix three parts baking soda with one part water to make a thick paste, spread it on the stain, leave it for 15 to 30 minutes, then scrub and rinse. For more ideas on gentle homemade cleaners, see our guide to how to make natural cleaning products.

TSP is the strong option for heavy, old soot. Dissolve about 60 grams (a quarter cup) of TSP in about four litres (a gallon) of warm water, following the label exactly. Scrub a small area at a time, then rinse well. TSP can irritate skin and harm some finishes, so protect the floor and wear gloves and glasses.

Step by Step: Scrubbing the Brick and Mortar

Once the brick is dry-cleaned and you have chosen a cleaner, work in small sections, about a square metre at a time. Brick dries unevenly, and a cleaner left to dry on the surface can leave marks, so finishing one patch before you start the next keeps the result even.

1. Wet the section lightly with clean water. Damp brick absorbs less dirty water, so soot stays on the surface.
2. Apply your chosen cleaner and let it sit for five to ten minutes, or up to 30 minutes for a baking-soda paste.
3. Scrub with a stiff nylon brush in small circles, starting at the top and working down.
4. Clean the mortar joints with an old toothbrush or a grout brush, using light pressure so you do not gouge soft, old mortar. If mortar crumbles or falls out in chunks, stop and have the joints checked first.
5. Rinse with a clean, damp rag and fresh water, changing the rinse water often.
6. Blot with a dry towel and let the brick air-dry before you judge the result. Wet brick always looks darker.
7. Repeat once on any areas that are still grey. A second gentle pass usually does more than one hard scrub.

Cleaning the Fireplace Glass and Firebox

The firebox and the glass doors need a different approach from the brick face. Remove the grate and andirons if you can, and take them outside to brush and wash. Vacuum the firebox floor and walls, then wash them with warm soapy water and a stiff brush, rinsing with a damp rag. Leave the damper open while the firebox dries so damp air can escape.

For glass doors, let them cool completely, then wipe off loose ash with a dry cloth. Make a paste from wood ash and a little water, or from baking soda and water, and rub it gently over the glass with a damp cloth or newspaper. For thick, baked-on deposits, use a cleaner made for fireplace glass and a plastic scraper, never a metal blade. Rinse, dry the glass so it does not streak, and check the door seals for cracks or gaps.

Stubborn Smoke Stains That Will Not Budge

Some stains are not ordinary soot. Years of smoke above the opening, a chimney that draws poorly, or a fire left to smoulder can leave dark, shiny creosote marks and deep brown stains that soak into the brick. These need more time, not more force.

Try a baking-soda paste first, left on for an hour under a damp cloth so it does not dry out, then scrub and rinse. If that fails, move to a TSP solution on the stain only, scrubbing in circles and rinsing well. A dry chemical sponge used again after the brick has dried will often lift the last grey film. Stubborn stains respond to patience in the same way as other household stains, as our guide on how to get stains out of carpet shows: dwell time and a second pass beat hard scrubbing.

What NOT to Use on Brick

Brick looks tough, but it is porous and easy to damage with the wrong product. Avoid bleach, because it can lighten mortar unevenly and leave white salt marks. Avoid strong acids unless a mason tells you to use them; they can eat mortar and change the colour of the brick. Do not use a pressure washer, which drives water into the brick and breaks mortar joints, or wire brushes, steel wool and oven cleaner, which scratch the surface.

How Often to Clean, and When to Call a Chimney Professional

For a fireplace used a few times a week in winter, dry-clean the brick face and hearth every few weeks during the season and do a full wet clean once a year, ideally in spring. A fireplace used only now and then may need a full clean every one to two years. Clean the glass and empty the firebox more often, whenever ash builds up or the glass clouds over. A regular routine, like the step-by-step routine in our guide on how to clean a dishwasher, is easier to keep than one big clean after years of neglect.

Call a certified chimney sweep once a year for a chimney inspection and sweep, and sooner if you notice a strong smoky smell when the fireplace is not in use, smoke coming into the room, black, shiny or tarry build-up in the flue, falling debris, cracked or loose bricks, damaged mortar, or a damper that will not open or close. Creosote in the chimney is a fire risk that household cleaning cannot fix. A professional is also the right call if the brick is very old, the mortar is crumbling, or a stain returns soon after cleaning.

A Cleaner Fireplace, Step by Step

Knowing how to clean brick fireplace surfaces is mostly about order: let the fire go cold, ventilate the room, dry-clean first, then wash with the gentlest cleaner that works. Scrub in small sections, rinse often, and let the brick dry before you decide whether it needs another pass.

Frequently Asked Questions