A keyboard collects dust, crumbs and skin oils long before it looks completely filthy. You may notice shiny keys, a gritty feel around the space bar or debris trapped between rows. Fortunately, ordinary surface cleaning needs little more than a soft brush and a carefully dampened cloth.
The important precaution is to disconnect the keyboard and keep liquids out of its openings. A desktop mechanical keyboard, a thin laptop keyboard and a wireless Apple keyboard may not tolerate the same treatment, so check the model before removing keys or using chemicals.
Turn it off before cleaning
For an external wired keyboard, unplug it from the computer. For a wireless keyboard, switch it off and remove the batteries if they are user-removable.
If the keyboard is built into a laptop, shut the laptop down and unplug external power. Do not clean a running laptop by typing dozens of random commands onto an open screen.
Apple's official cleaning guidance begins by turning off peripherals and unplugging wired devices. That is a sound general starting point for ordinary household keyboard care.
Check whether the manufacturer permits key removal
Some mechanical keyboards have removable keycaps designed for cleaning. Many laptop keyboards use delicate scissor or butterfly mechanisms and can be damaged if keys are pulled off.
Don't start levering keys with a knife because somebody online removed them from a different model. Search the manufacturer's instructions for your exact keyboard first.
If the keycaps aren't intended to be removed by consumers, clean around them with suitable tools and leave the internal mechanism alone.
Remove loose crumbs gently
Turn a detached keyboard at an angle and tap it lightly to dislodge crumbs. Support it securely rather than banging it on a worktop.
Use a soft, dry brush to sweep between rows of keys. A small electronics-cleaning brush is useful, but a clean soft paintbrush may work if it sheds no bristles and has never been used with paint or solvents.
Brush debris towards an edge where it can fall away. Avoid pushing crumbs further down under the keys with a pointed object.
Use compressed air only where allowed
Some manufacturers recommend carefully applied compressed air for certain keyboard problems, while others discourage aerosol sprays or compressed-air treatment on specific devices.
Check the exact product guidance. Don't blast air through the keyboard indiscriminately or hold an air duster in a way that releases liquid propellant into electronics.
If the manufacturer permits compressed air, follow its distance, angle and handling instructions. A soft brush alone may be sufficient for ordinary surface dust.
Wipe the key surfaces
Use a soft lint-free cloth very lightly dampened with water. The cloth should not drip when squeezed. Wipe key tops gently, particularly the space bar and frequently used letters.
Apple recommends a lint-free cloth lightly moistened with water for its external keyboards, taking care not to let moisture enter openings.
Avoid abrasive scouring pads and rough kitchen paper on coated or printed keys. Repeated harsh wiping can wear away markings or leave scratches.
Can you disinfect a keyboard?
Some manufacturers permit suitable disinfectant wipes on hard, non-porous surfaces. Apple allows careful use of 70% isopropyl alcohol wipes or 75% ethyl alcohol wipes on relevant exterior surfaces, while warning against excess moisture.
That does not mean every keyboard is safe to soak in alcohol. Check your brand's instructions, especially for specialised coatings, leather parts or decorative finishes.
Don't spray disinfectant directly onto the keys. Apply approved material to the cloth or use an appropriate wipe and keep liquid away from gaps and ports.
Get into the edges and corners
A soft brush can lift dust from the narrow area between keycaps and the case. Work patiently around the larger keys, where crumbs often collect.
A clean, barely damp cotton bud may help with accessible outer corners, provided you avoid forcing fibres or moisture into the mechanism. Use a dry swab where practicable.
Don't use a metal pick to dig under the key switches. Scratching the surface or dislodging a fragile mechanism is a poor exchange for removing one crumb.
Cleaning a removable mechanical keycap set
If your keyboard manufacturer supports keycap removal, take a photograph of the layout before starting. Different keyboards have different modifier keys and non-standard key sizes.
Remove caps using an appropriate keycap puller without forcing them. Clean the caps according to the manufacturer's material guidance, then let them become completely dry before reinstalling.
Avoid soaking an entire keyboard assembly or exposing electronic switches to water. The removable plastic caps and the circuitry beneath them are not the same thing.
What if a key feels sticky?
A sticky key may have surface residue, crumbs under the cap or a damaged internal switch. Start with the least invasive cleaning the manufacturer recommends.
Do not pour water, alcohol or lubricant through the key opening to 'flush out' the problem. Liquid can travel into electronics and cause further damage.
If the key remains stuck after safe external cleaning, consider a professional repair or a manufacturer-approved key replacement procedure. Some laptop keys are especially easy to break when pried upward.
How to handle a liquid spill
If liquid has entered an electronic keyboard, disconnect power promptly when safe and follow the manufacturer's spill instructions. Do not continue typing to test whether the keys still work.
For a laptop, liquid may reach components beyond the keyboard. Shut down, disconnect external power and seek appropriate service advice. Apple recommends authorised help if liquid enters its products.
Don't rely on rice, a hairdryer or a hot radiator to repair internal electrical damage. Heat and hidden moisture can make the situation worse.
Clean around the keyboard as well
Dust and crumbs on the desk can return to the keyboard immediately after cleaning. Wipe the nearby surface and keep drinks away from the keys.
If you eat at the desk, a quick brush every few days is easier than trying to remove months of sticky debris. Wash hands after gardening, cooking or using greasy products before returning to the keyboard.
Keep the computer screen and mouse clean using their own manufacturer-specific instructions. A cleaning chemical suitable for a keyboard case may not suit a monitor's coating.
Let everything dry before reconnecting
After wiping, leave the keyboard unplugged until any residual moisture has dried. Don't hasten this by placing it on a heater.
Check ports and edges visually before reconnecting. Reinsert batteries or plug the device back in only when it is fully dry.
If unusual behaviour follows cleaning, stop using it and investigate. Keys repeatedly triggering commands or a device disconnecting can indicate internal damage rather than a need for further cleaning.
Mistakes that shorten a keyboard's life
Removing non-removable keys, spraying liquid directly onto the board and using harsh solvents are common ways to turn a cosmetic job into an expensive repair.
Aggressive compressed air can be unsuitable for certain mechanisms. Following a different manufacturer's instructions without checking is another preventable problem.
For an everyday clean, restraint wins: disconnect, brush away crumbs, wipe gently and let dry. More force is rarely necessary.