How to clean a camera lens safely, step by step

To clean a camera lens, first blow loose dust and grit off the glass with a hand blower. Then wipe the lens gently in a circular motion from the centre outward with a clean microfiber cloth or lens cleaning paper, using a few drops of lens cleaner only if the surface is smudged. Put the cleaner on the cloth, never on the lens, and never use solvents such as thinner or benzine.^[1][2][3]

What you need

The manufacturers' instructions agree on a short list of tools:

• A hand-held blower. Tamron recommends it because you control the strength of the air, and advises caution with can-type air dusters.^[4] Sony warns against spray-type blowers inside the camera's lens mount.^[1]
• A soft lens brush for dust that sticks.^[2]
• A clean microfiber or other soft cloth, or lens cleaning paper. Unlike ordinary tissue, lens paper does not leave fibers behind, and a fresh sheet means no dirt from the last wipe.^[4]
• A lens cleaner made for camera lenses.^[4]
• Cotton swabs for the lens mount ring.^[4]

Step by step: cleaning the front element

1. Pick a clean spot. Work where little dust is moving and hold the lens with the front pointing down, so loose particles fall away.^[5]
2. Blow first. Remove dust and sand with the blower before you touch the glass. Wiping over grit can scratch the surface. Keep the tip of the blower off the lens.^[4][2]
3. Do not blow with your mouth. Moisture from your breath can cause smudges.^[5]
4. Brush off stuck dust. If particles remain, sweep them away with a soft lens brush, starting at the centre.^[2][5]
5. Wipe smudges and fingerprints. Fold the lens paper or take a clean cloth. For oily marks, put a few drops of lens cleaner on the paper or cloth, never directly on the lens. Wipe from the centre outward in a spiral or circular motion with very little pressure.^[1][4]
6. Dry and check. Finish with a dry part of the cloth or a second dry cloth, then check the lens in good light. If a mark remains, repeat with fresh paper.^[5][6]

Pressing hard can damage the coating.^[4]

Rear element, mount and barrel

Clean the rear element the same way, using a lens cloth or cotton swab around the mount ring. Do not touch the electrical contacts with your fingers, because skin oils stick to them.^[4] Nikon and Fujifilm also ask you to keep the contacts clean, and Sony says not to touch the contacts inside the camera's lens mount.^[3][7][1]

For the barrel, blow dust out of the grooves around the zoom and focus rings first, then wipe the whole barrel dry with a cloth, without cleaner and without scrubbing hard. On zoom lenses that extend, wipe with the lens fully extended.^[4]

What not to use

• Organic solvents such as thinner or benzine. Canon, Nikon, Sony, Fujifilm and Tamron all say so.^{[8][3][1][7][4]}
• Ammonia-based cleaners on lenses or filters. Canon warns they can cause fogging with some materials and coatings.^[8]
• Cleaner sprayed on the lens. Sony and ZEISS say to apply it to the cloth.^[1][9]
• Tissue, clothing and rough cloths. ZEISS puts it plainly for its glasses lenses: do not reach for a tissue, tie or sleeve.^[10]
• Cleaner on a lens with an antifouling coating. Tamron says it may make the coating peel and recommends dry wiping only.^[4]
• Alcohol on coated lens surfaces. Canon advises against ethanol and isopropyl alcohol there. Nikon and Fujifilm, in their lens manuals, name ethanol or lens cleaner for fingerprints.^[8][3][7] Because the manufacturers disagree, a commercial lens cleaner and your lens manual are the safe choice.
• Air dusters and canned air. Sony advises against air dusters and compressed air near the image sensor and against spray-type blowers in the camera's lens mount.^[11][1]

None of the manufacturer instructions reviewed here recommend household cleaners such as dish soap or window cleaner, so they are left out of this guide.

When to clean, and what to do after sand, salt water or rain

How often to clean a lens

Clean when you can see dirt, for example after fingerprints, a windy day outdoors, or a trip to a beach or desert. Tamron suggests routine cleaning every two to three months, and says excessive cleaning can do more harm than good. Without visible stains, a dry wipe is enough.^[4] For its cinema lenses, Canon recommends a routine inspection about once a year, depending on use.^[2]

After sand, salt water and rain

Sand: blow it out first, especially around the zoom and focus rings and the mount. Make sure no grains remain before you wipe, because grains can scratch the glass and the moving parts.^[4]

Salt water and rain: after shooting at the sea, wipe off the droplets carefully, because the salt can damage the lens. Wipe the whole lens including joints and grooves, extended to its full length, and dry it thoroughly before storing it.^[4] Canon recommends wiping off water with a dry microfiber cloth after a light shower, and after a heavy downpour not switching the camera back on until it is completely dry.^[6]

Preventing dirt, moisture and mold

• Keep caps on. Fit front and rear caps whenever the lens is not in use or goes into its case.^[3] Caps also matter for safety: a lens can focus sunlight and cause a fire.^[7][2]
• A lens hood or a filter can protect the front element. Nikon names the hood, and Canon and ZEISS name protective filters. A filter needs cleaning too.^[3][6][9]
• Store lenses cool and dry, away from direct sunlight. Tamron gives 40 to 50 percent humidity as a guideline, because too dry also harms grease, rubber and coatings. Remove the lens from the camera and the filters from the lens, and store it with both caps on.^[4][3]
• Avoid condensation. Coming from cold into a warm room, leave the lens in its bag until it has adjusted to the temperature. Condensation that stays on the lens can lead to water stains and eventually mold.^[4]
• Every two to three months, take stored lenses out and turn the focus and zoom rings, which also lets you check that they work.^[4]

Dust, haze or fungus inside the lens

Do not open the lens yourself. Fujifilm's lens manual prohibits disassembly (never open the case).^[7] Sony notes that its warranty does not cover damage caused by mishandling at unauthorized service locations.^[11]

Tamron says it is very difficult to restore a lens once mold has grown, and in many cases the lens has to be replaced. Prevention matters more than a cure.^[4] Dust on the image sensor is a separate problem. Canon recommends having sensor dust removed by a professional service.^[6]

Frequently asked questions

Can you clean a camera lens with a microfiber cloth?

Yes, as long as the cloth is clean. Blow off dust first, so the cloth does not drag grit across the glass. Canon suggests keeping two cloths, one for smudges and one for drying.^[6] ZEISS advises washing microfiber cloths in water no warmer than 40 degrees Celsius and without fabric softener, otherwise they leave streaks.^[10]

Can you clean a lens with isopropyl alcohol?

The manufacturers disagree. Canon advises against ethanol and isopropyl alcohol on coated lens surfaces. Nikon and Fujifilm name ethanol or lens cleaner in their manuals. None of the instructions reviewed here name isopropyl alcohol for lens glass. A lens cleaner made for camera lenses is the safe choice.^[8][3][7]

How do you clean the inside of a lens?

You do not. The manufacturers' instructions cover only the outside. For dust or haze inside, do not open the lens: Fujifilm prohibits disassembly, and Tamron points to the manufacturer's maintenance service when something is wrong with a lens.^[7][4]

How often should a camera lens be cleaned?

When it is visibly dirty, and otherwise every two to three months at most. Without stains, a dry wipe is enough.^[4]

Is a protective filter necessary?

It is optional. Canon says a screw-on filter takes the brunt of an impact instead of the lens, and ZEISS names UV and polarizing filters as a way to reduce the risk of scratches. Nikon names the lens hood or filters.^[6][9][3]