Cleaning a mirror badly takes about the same effort as cleaning one well. The difference is entirely in the order of operations, and the streaks people fight are almost always caused by the same three things: too much liquid, a cloth that sheds or smears, and letting the glass dry on its own.
There is also a fourth thing nobody warns you about, and it does permanent damage rather than cosmetic. Spraying cleaner directly onto the glass sends liquid down to the bottom edge, where it sits in the join between the glass and the frame and works its way under the silvering. That is where the black speckling on old mirrors comes from, and it does not come off.
Key Takeaways
- Spray the cloth, never the mirror. Liquid running to the bottom edge is what destroys the silvering.
- Two microfibre cloths: one barely damp to clean, one dry to buff immediately behind it.
- Use distilled water. Tap water leaves mineral spots that look exactly like streaks.
- Work in overlapping S strokes from the top down, not in circles.
- Keep everything away from a timber frame, and wipe the frame separately with a barely damp cloth.
Why Mirrors Streak
Too much product. Most streaks are not dirt, they are dried cleaner. Glass needs a trace of liquid to lift dust and skin oil, and anything beyond that has to evaporate somewhere, leaving whatever was dissolved in it behind on the surface.
The wrong cloth. Paper towel breaks up and leaves lint. A tea towel that has been through a wash with fabric softener is coated in exactly the residue you are trying to remove. Newspaper is an old trick that now transfers modern ink onto the glass and your hands.
Drying too slowly. A mirror left to air dry will streak every time, because the liquid pulls back toward the last wet patch as it evaporates and deposits everything it was carrying there. Buffing dry immediately is what prevents it, not a better cleaner.
The Method
- Dust first. Run a dry microfibre cloth over the glass to lift loose dust. Skipping this turns dust into mud the moment you introduce liquid.
- Mix 50/50 distilled water and white vinegar in a spray bottle, or use a dedicated glass cleaner. Distilled water matters more than the vinegar: tap water in most Australian cities carries enough dissolved minerals to leave spots on drying.
- Spray the cloth, not the mirror. Damp, not wet. If you can wring anything out of it, it has too much on it.
- Wipe in overlapping S strokes, starting at the top. Top to bottom means gravity works with you and you never wipe over an area you have already dried. Circles are what create the swirl pattern people mistake for streaks.
- Buff dry immediately with the second cloth, following two or three strokes behind the first. This is the step that decides the result.
- Check on an angle. Stand to one side with light across the glass. Streaks are invisible face on and obvious at 30 degrees.
The Frame Is the Part You Can Actually Ruin
The glass will forgive you. The frame will not. Every Cedora mirror is timber framed and between 4cm and 5.5cm deep, which means there is a join running the full perimeter where the glass meets the timber, and any liquid that reaches it has nowhere useful to go.
Two consequences. Liquid sitting in that join wicks behind the glass and lifts the silvering from the edge inward, which shows up as black or grey speckling a few millimetres in from the frame. And repeated wetting of raw or lightly finished timber raises the grain and eventually opens the joint.
So: never spray the mirror, keep the damp cloth away from the last two centimetres at the bottom, and clean the frame as a separate job with a barely damp cloth followed immediately by a dry one. Avoid ammonia based cleaners entirely on a timber framed mirror. They work well on frameless bathroom glass and they are hard on finishes.
Spots That Do Not Wipe Off
Toothpaste, hairspray and dried water splash. These are deposits sitting on the surface rather than smears. Put a little isopropyl alcohol on a cotton bud and work the spot alone, then clean the whole mirror normally. Spot treatment first, full clean second, always in that order.
Hard water marks. Neat white vinegar on a cloth, held against the mark for a minute to soften the mineral deposit, then wiped and buffed. Do not scrape glass with anything metal.
Black speckling at the edges. This is desilvering and it is permanent. It cannot be cleaned off because it is not on the surface. All you can do is stop it spreading by keeping liquid away from that edge, which means the frame side of the routine matters more than the glass side.
Shop Cedora Mirrors
Oak Top & Solid Pine Structure
Solid Pine & Acacia Structure
Solid Pine Structure
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Solid Pine Structure
Liverpool Pine Mirror - Natural
Solid Pine Frame with Oak Veneer
Hanging or Leaning Changes the Job
A mirror leaning on a chest of drawers is far easier to clean well, because you can tilt it, get light across it and reach the bottom edge without stretching. Every Cedora chest is 45cm deep, which holds a 5cm frame safely, and the arrangement stays put as long as there is a restraint at the top so the mirror cannot walk forward.
A hung mirror needs more care at the bottom edge specifically, because that is where liquid collects and where you are least able to see what you are doing. Clean the bottom 20cm last, with the driest cloth, and finish with a dry buff along the join.
If you are still deciding which way to go, we covered the fixings and the weights in how to hang a heavy mirror, and what to put underneath in how to decorate a wall mirror.
How Often, and What Not to Bother With
A bedroom mirror needs a proper clean every two to four weeks and a dry dust in between. A mirror opposite a window will show marks sooner, not because it gets dirtier but because raking light makes every deposit visible.
Things that are not worth doing: buying a specialist mirror cleaner when distilled water and vinegar does the same job, using a squeegee on a framed mirror where the blade cannot reach the last centimetre, and cleaning in direct sunlight, which dries the liquid before you can buff it and guarantees streaks.
Frequently Asked Questions
How do you clean a mirror without leaving streaks?
Dust the glass dry first, spray a 50/50 mix of distilled water and white vinegar onto a microfibre cloth rather than onto the mirror, wipe in overlapping S strokes from the top down, then buff dry immediately with a second dry cloth. The immediate dry buff is what prevents streaks.
Why should you not spray cleaner directly on a mirror?
Because the liquid runs to the bottom edge and sits in the join between the glass and the frame. From there it works under the silvering and causes the black speckling you see on old mirrors, which is permanent. It also soaks the timber frame.
What is the best cloth for cleaning a mirror?
Two microfibre cloths, one barely damp and one dry. Avoid paper towel, which leaves lint, and any cloth washed with fabric softener, which leaves exactly the residue you are trying to remove.
Can you use vinegar on a mirror?
Yes, diluted 50/50 with distilled water and applied to the cloth rather than the glass. Keep it off the timber frame and away from the bottom edge. Avoid ammonia based cleaners on framed mirrors, as they are hard on timber finishes.
How do you get hairspray or toothpaste off a mirror?
Treat the spot alone with a little isopropyl alcohol on a cotton bud, then clean the whole mirror normally. Spot first, full clean second. Never scrape glass with anything metal.
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