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How to clean old photos before scanning

By PicReviver Team · Last updated: July 2026

Dust that is on the print when you scan it is in the file forever. But more old photos are destroyed by enthusiastic cleaning than by the dust itself, and the difference between the two comes down to about five minutes of technique.

What you are actually cleaning

A photographic print is not a piece of paper with ink on it. The image sits in a wafer-thin layer of gelatin emulsion on top of the paper — soft, water-soluble, and easily scratched once it is more than a few decades old. Everything below follows from that one fact: dry is safe, wet is not, and pressure is the enemy.

So the goal is modest. You are removing loose surface dust and nothing else. Anything stuck to the print, embedded in it, or grown into it stays where it is and gets dealt with afterwards, in software, where a mistake costs you nothing.

What you need

• A rubber hand blower (the kind sold for camera lenses). This does most of the work.
• A soft brush — an anti-static brush, a lens brush, or a clean, never-used make-up brush. Soft enough that it bends under its own weight.
• A lint-free microfibre cloth, for glossy prints and for the scanner glass.
• Clean dry hands, or cotton gloves if you have them.
• Isopropyl alcohol — for the scanner glass only. It never touches a print.

Note what is missing from that list: canned air. It is high pressure, which drives grit sideways into the emulsion instead of lifting it off, and if the can tips even slightly it sprays liquid propellant across your photo. A £6 rubber blower is both safer and, for one print at a time, faster.

The routine, in order

1. Hold the print by its edges. Fingerprints are not just a smudge you can wipe off later: the oil holds dust in place and slowly etches into the emulsion over years.
2. Blow first. Two or three squeezes across the surface at a shallow angle. This lifts the dust that a brush would otherwise drag.
3. Then brush, once, in one direction. Sweep from one edge to the other and lift the brush off at the end. Scrubbing back and forth is exactly how a single grain of sand becomes a scratch across a face.
4. Wipe only if the print is glossy, and only with a dry microfibre cloth, using no more pressure than the weight of your hand. A matte, textured, cracked or flaking print does not get wiped at all — the cloth catches the raised edges and takes flakes of image with it.
5. Check it against the light at a low angle before scanning. Dust is nearly invisible face-on and obvious from the side.

What never goes on a print

• Water. Wet gelatin softens on contact; a damp cloth lifts image, not dirt.
• Glass cleaner, alcohol, or any solvent. These dissolve the dyes of a colour print and can strip the emulsion off a black-and-white one.
• Household or baby wipes. Wet and mildly abrasive: the worst possible combination.
• Erasers, magic sponges, or anything abrasive. They remove the surface, and the surface is the photograph.
• Tape, sticky rollers or lint rollers. The adhesive can pull the emulsion clean off, especially where it is already cracked.
• Heat — no hairdryers, no radiators. Gelatin curls and cracks.

The awkward cases

Photos stuck together, or stuck to glass

Do not pull. Prints that have been wet and dried, or that sat under frame glass for thirty years, are bonded emulsion-to-emulsion and separating them by force tears the image in half. This is one of the few situations genuinely worth a professional conservator. If the photo is not irreplaceable, scanning it through the frame glass — cleaned, and angled slightly to kill the reflection — gives you a usable file today.

Mould and mildew

Never wet a mouldy print; moisture is what wakes mould up. Dry the photo out fully in a ventilated room away from the rest of your collection, then take it outdoors, put on a dust mask, and brush the dried spores off with a soft brush. What is left behind — the brown or purple staining where mould has eaten into the emulsion — is permanent damage, not dirt, and belongs in the software stage below.

Curled or creased prints

Flatten before scanning, not during. Sandwich the print between two sheets of plain acid-free paper, put it under a stack of books, and leave it for a few days. Pressing a curled photo flat under the scanner lid instead is how you get a fresh crease straight through it.

Do not forget the glass

The scanner glass matters as much as the print does, and gets skipped constantly. A single speck on the glass appears as a bright white dot in the same spot on every single scan of that session — and white dots on a dark area are among the hardest marks to repair afterwards, because there is no surrounding detail to rebuild from.

Put a few drops of isopropyl alcohol on the microfibre cloth — never spray it onto the glass, where it runs into the scanner's electronics — wipe, then dry with a second clean cloth. Do it again halfway through a long batch: dust settles as you work.

What to leave for software

Here is the part most guides get backwards. Scratches, water stains, foxing, fading and colour casts are damage to the emulsion itself. Nothing you can safely apply to a print will lift them, and everything strong enough to try will take image with it. Those marks are precisely what digital restoration is for, and they cost you nothing to attempt because the original stays untouched on your desk.

So: clean the loose dust, scan it properly at 600 DPI (see how to scan old photos), and hand the rest to the tool. Scratches and creases, water damage, tears and missing corners and faded colour all have far better odds as pixels than as chemistry.

Common questions

How do you clean old photos before scanning?
Dry, and in that order: hold by the edges, blow the loose dust off with a rubber blower, sweep once with a soft brush, and wipe with a dry microfibre cloth only if the print is glossy. Then clean the scanner glass with isopropyl alcohol on the cloth.

Can I use water or alcohol on an old photo?
No. The image sits in gelatin, which softens the moment it gets wet, and solvents dissolve the dyes of a colour print. Every liquid in this guide is for the glass, not the photo.

What if the photos have mould?
Dry them out first, then brush the spores off outdoors with a mask on. Never wet them. The staining left behind is permanent damage and a job for digital repair.

Should I remove scratches and stains before scanning?
No — scan them as they are. Anything abrasive enough to shift a scratch removes image with it, while software can attempt the same repair a hundred times without touching the original.

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