Mirror guide

How to Clean a Mirror Without Streaks

By Joan Bardot · Updated 1 sources cited

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Bright bathroom vanity with a white marble countertop and a large frameless rectangular mirror reflecting a glass shower and a window, with a folded blue microfiber cloth beside the sink
On this page
  1. Why Mirrors Streak
  2. How to Clean a Mirror Step by Step
  3. The Best Mirror Cleaner: What Actually Works
  4. How to Clean LED, Lighted and Anti-Fog Mirrors
  5. Protect the Edges: Why Mirrors Go Black
  6. Large Mirrors and Mirror Walls
  7. Framed and Decorative Mirrors

Learning how to clean a mirror without streaks is mostly about using less: less cleaner, fewer passes, and a cloth that leaves nothing behind. In beauty work you wipe down mirrors constantly, and in my experience the ones that look worst after cleaning are the ones that got the most spray.

The method below works on any glass mirror, from a bathroom mirror to a mirror wall. I also cover the mirrors that need extra care: the LED bathroom mirrors with electrics behind the glass, fog-free shaving mirrors, and framed bathroom wall mirrors whose edges suffer when liquid gets behind them.

Why Mirrors Streak

A streak is something left on the glass that bends the light: cleaner that dried before you wiped it off, soap or hairspray film you spread around, lint from the cloth, or minerals from hard tap water. The usual causes:

  • Too much cleaner. What the cloth cannot absorb dries into a film.
  • A dirty or fabric-softened cloth. Softener leaves a waxy coat that smears; old grime goes straight back on the glass.
  • Paper towels. They shed lint and push liquid around rather than lifting it.
  • Heat and sun. Cleaner flashes dry on a warm mirror or in direct sunlight before you can buff it.
  • Skipping the dry buff. The last pass with a dry cloth is what removes the final thin film.

What You Need

Two clean cloths and warm water do most of the work. The ammonia-free cleaner is only for spots that water will not shift.

  1. 1Microfiber cloths

    MR.SIGA Microfiber Glass Cloths, 6 Pack

    Fine, lint-free, non-abrasive microfiber at 13.7 by 15.7 inches, machine washable. Six means you always have a dry one for buffing.

    Check price on Amazon

  2. 2Glass cleaner

    Sprayway Foaming Glass Cleaner, 6 Pack

    A foaming aerosol for glass that the listing describes as ammonia-free and says lifts fingerprints, dust, dirt and smoke film. Spray it onto the cloth, not the mirror, and only for spots warm water will not shift.

    Check price on Amazon

  3. 3Water-only cloths

    E-Cloth Window and Glass Kit

    A waffle-weave cloth used damp with plain water, then a smooth polishing cloth used dry. No cleaner at all, which is the gentlest option for LED and coated mirrors.

    Check price on Amazon

  4. 4Squeegee

    MR.SIGA 14" Squeegee and Scrubber

    A 14 inch squeegee with a natural rubber blade plus a microfiber scrubber, for large mirrors, mirror walls and shower glass.

    Check price on Amazon

How to Clean a Mirror Step by Step

This takes about five minutes for a bathroom mirror. Do it when the room is cool and out of direct sun.

Cleaning a mirror without streaks

  1. Dust the mirror dry

    Wipe the whole mirror with a dry microfiber cloth first. Dust and hair mixed with cleaner turn into the gray smears that people blame on the spray. Do the frame and the top edge too.

    Hand pressing a dry gray microfiber cloth against a large bathroom mirror to wipe off dust before cleaning

  2. Soften stubborn spots

    Hold a pad or cloth dampened with warm water on dried toothpaste and makeup for a few seconds, then wipe. Most spots let go once they soften. If one will not, mist a little mild, ammonia-free glass cleaner onto the pad, never onto the mirror, and dab again. Do not scrape with anything abrasive.

    Fingers dabbing a cotton pad on a dried white toothpaste spot on a bathroom mirror

  3. Spray the cloth, not the mirror

    Dampen a clean microfiber cloth with warm water and wring it out well, or mist a little ammonia-free cleaner onto it if the mirror is filmy. Spraying the glass sends drips down to the bottom edge, where they can seep behind the mirror. One or two sprays per section is enough.

    Hand spraying clear cleaner from an unlabeled spray bottle onto a blue microfiber cloth held in front of a bathroom mirror

  4. Wipe top to bottom, then buff dry

    Wipe in overlapping strokes from the top down, in an S pattern, so you are always moving dirt toward a clean area. Then buff the whole mirror with a second, dry microfiber cloth, or pull a squeegee down it, until no haze is left. Finish by drying the edges and the bottom, where moisture sits. Check from an angle, with light coming from the side.

    Hand wiping a damp bathroom mirror with a blue microfiber cloth, leaving a clear band through the water droplets

The Best Mirror Cleaner: What Actually Works

There is no magic formula, and the mirror makers agree. The National Glass Association's mirror cleaning bulletin, written with manufacturers of quality mirrors, puts it plainly: the very best and safest cleaner for a mirror is clean, warm water and a soft, lint-free cloth. These are the options I rate, in the order I would try them.

Warm water and a good microfiber cloth

This is the method I use on almost every mirror. Wring the cloth until it is barely damp, wipe, then dry the glass straight away with a dry lint-free cloth. A two-cloth system like the E-Cloth kit is built around exactly this, and it is the safest choice for LED and coated mirrors too. If your tap water is hard and leaves spots, use distilled water.

A mild, ammonia-free glass cleaner, on the cloth

For bathroom film that water will not shift, use a small amount of a mild glass cleaner that contains neither ammonia nor vinegar, sprayed onto the cloth rather than the mirror. Sprayway's foam is sold as ammonia-free; check the label of any cleaner you buy for both ingredients.

Why I skip vinegar on mirrors

Equal parts white vinegar and water is the most repeated mirror tip online, but glass makers advise against it. The NGA bulletin says not to use mirror cleaners that contain ammonia or vinegar, and not to use acid or alkali cleaners at all, because they can attack the front surface, the edges and the silver backing. Vinegar is an acid and ammonia is an alkali. On a window that is a small risk; on a mirror, it is how black edges start.

What to avoid

  • Vinegar, ammonia, bleach and any other acid or alkali cleaner.
  • Solvents such as rubbing alcohol and acetone, which can damage the edges and backing.
  • Abrasive powders, scouring cream and scrub pads, which scratch glass and coatings.
  • Spraying anything directly onto the mirror.
  • Newspaper, an old trick that can leave ink on frames and grout.
  • Paper towels, which leave lint.

How to Clean LED, Lighted and Anti-Fog Mirrors

A lighted mirror has drivers, wiring and sometimes a heating pad behind the glass. Water in the wrong place can damage it or create a shock risk, so the rules are stricter.

Switch it off first

Turn the mirror off and unplug it. For a hardwired mirror, switch it off at the wall switch, and if you will be cleaning around the edges, at the breaker. If it has a defogger, let the glass cool before you clean.

Never spray onto the mirror

Spray only onto the cloth, and use as little liquid as possible. Keep moisture away from the edges, the frosted light band, touch buttons and sensors, and the seams where the glass meets the frame. A water-only microfiber is the gentlest choice.

Read the maker's manual

Some LED and anti-fog mirrors have coatings that their makers say should not meet certain cleaners. If the manual names a cleaner to avoid, avoid it. On fog-free shower mirrors, follow the maker's care instructions to keep the anti-fog surface working.

Protect the Edges: Why Mirrors Go Black

The reflective layer of a mirror is a thin coat of silver on the back of the glass, protected by paint. When cleaner or water runs down and soaks into the bottom edge again and again, it can attack that layer from the edge inward. The result is the dark, spreading patches people call desilvering, and it cannot be cleaned off.

Four habits prevent it: spray the cloth rather than the mirror, skip vinegar, ammonia and solvent cleaners, dry the edges and the bottom after cleaning, and keep the bathroom ventilated so the mirror is not wet for hours after every shower.

Large Mirrors and Mirror Walls

For a mirror wall in a home gym or dance room, cloths alone take forever and streak where you overlap. Borrow the window cleaner's squeegee, but not the soaking: dampen the scrubber in warm water and squeeze it out so it is not dripping, wipe one panel at a time, then pull the squeegee down in long overlapping strokes, wiping the blade after each one. Glass makers advise wiping along the joints between panels, never across them, so liquid does not collect in the seams. Finish the joints, edges and bottom with a dry microfiber. My guide to home gym mirrors covers the panels themselves.

Framed and Decorative Mirrors

Clean the glass with a lightly dampened cloth and keep liquid off the frame. Gold leaf, painted and wooden frames only need a soft dry cloth or a soft brush, and beaded or carved frames collect dust in their crevices, so give them a brush now and then.

Sources

  1. National Glass Association: Proper Procedures for Cleaning Flat Glass Mirrors (FB06-05) Warm water and a lint-free cloth as the safest cleaner, cleaner on the cloth rather than the mirror, no ammonia, vinegar, acid, alkali, solvents or abrasives, wipe along the joints of mirror walls, and dry edges to prevent black edge.
Usually because something stayed on the glass: too much cleaner that dried into a film, a cloth with dirt or fabric softener in it, or lint from paper towels. Dust the mirror first, spray the cloth instead of the glass, use very little product and buff with a second, completely dry microfiber cloth.
Warm water. Glass makers name clean, warm water on a soft, lint-free cloth as the best and safest mirror cleaner, and it leaves nothing behind to streak. For bathroom film it will not shift, use a little mild glass cleaner with no ammonia or vinegar, sprayed onto the cloth. Sprayway's foam is sold as ammonia-free. Always finish with a dry buff and dry edges.
Cloudy film is usually soap, hairspray or minerals from hard water. Wipe the mirror with a well-wrung cloth and warm water, and if the film stays, with a little mild, ammonia-free glass cleaner sprayed onto the cloth, then buff dry. Skip vinegar and rubbing alcohol: glass makers warn that acids and solvents can attack a mirror's edges and backing. If the cloudiness is behind the glass or creeping in from the edges, it is damage to the silver backing and cannot be cleaned.
Most window cleaners use a squeegee, a scrubber and a bucket of water with a small amount of dish liquid, then dry the edges with a lint-free cloth. The squeegee removes the water in one pass, so nothing dries on the glass. On mirrors, keep the tools but use far less liquid: a wrung-out scrubber with warm water, the squeegee, and a dry cloth along every edge and joint so nothing seeps behind the glass.
I would not. Glass makers advise against vinegar on any mirror, because acids can attack the edges and the silver backing, and an LED mirror adds coatings and electrics to worry about. Switch it off and unplug it, then use a microfiber cloth barely dampened with warm water, never sprayed on the mirror. If the maker's manual names a cleaner, follow the manual.
A quick dry-cloth wipe every few days keeps dust and splashes from building up, and a full clean once a week is enough for most bathrooms. Mirrors right above a busy sink may need spot cleaning daily. The less you let build up, the less cleaner you need, and the fewer streaks you get.

Keep reading: Best LED bathroom mirrors · Best shaving and shower mirrors · Bathroom wall mirrors · How to hang a heavy mirror · Acrylic vs glass mirrors

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