Dust, fingerprints, skin oils and old thermal paste build up on every device eventually. Isopropyl alcohol (IPA) is the go-to fix for repair techs and hobbyists alike, but only if you use the right strength and the right method.

Get it wrong and you risk moisture damage, cloudy plastics or a device that won't power back on. Here's how to do it properly.

Why 99% IPA (and not 70%)

For electronics, purity matters more than anything else.

• 99% IPA has almost no water, evaporates in seconds and leaves very little residue
• 70% IPA contains 30% water, which dries slower and can sit on components
• Water plus electricity is the problem you're trying to avoid

Keep 70% for wiping down desks and tool surfaces. For anything electronic, reach for 99% Isopropyl Alcohol. Not sure about the difference? Read Isopropyl Alcohol 70% vs 99%: Which to Use?

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What you'll need

• 99% isopropyl alcohol
• Lint-free microfiber cloths
• Foam or lint-free swabs (cotton swabs shed fibers that snag on components)
• A soft anti-static brush or a clean, soft toothbrush
• Compressed air (optional, for loose dust)
• A well-ventilated workspace

Step-by-step: How to Clean Electronics with IPA?

The method is the same whether you're cleaning a keyboard, a laptop or a bare circuit board. What matters is the order: cut the power, clear the dust, use a small amount of alcohol, and give it time to evaporate.

Follow these seven steps for a safe, residue-free clean every time.

1. Power down completely. Switch off, unplug and remove the battery if you can. Give capacitors a few minutes to discharge.
2. Remove loose dust first. Use compressed air or a soft brush so you're not just pushing grime around with alcohol.
3. Apply IPA to the cloth or swab, not the device. Dampen it lightly. Never pour or spray directly onto electronics.
4. Wipe gently. Use light pressure and short strokes. Use a fresh side of the cloth or a new swab as it gets dirty.
5. Work into tight spots with a swab or brush. Connectors, ports and spaces between keys are easier with a swab.
6. Let it dry fully. 99% IPA flashes off fast, but give it at least 10 to 15 minutes before powering on. Allow longer for heavily cleaned boards or hard-to-reach areas.
7. Inspect before reconnecting. Check for leftover fibers, residue or pooled liquid under components.

Device-by-device Tips

Keyboards

• Turn the keyboard upside down and tap out crumbs first
• Wipe keycaps with a dampened cloth and use a swab between keys
• On mechanical keyboards, pull the keycaps off for a deeper clean

Laptops and PC components (thermal paste removal)

• Wipe off most of the old paste with a dry lint-free cloth first
• Finish with an IPA-dampened cloth until the CPU and heatsink surfaces are clean
• Let both dry fully before applying fresh paste

Circuit boards (PCBs) and flux residue

• Scrub gently with an IPA-dampened soft brush to lift flux
• Wipe away the loosened residue with a lint-free cloth
• Repeat until no sticky film remains, then allow plenty of drying time

Connectors and ports

• Use a lightly dampened swab and gentle motion
• Make sure no fibers are left behind inside the port
• Don't force a swab into very small ports. Use compressed air instead.

Phone, tablet and laptop exteriors

• Use a lightly dampened cloth on hard, non-porous surfaces
• Avoid openings like speaker grilles, charging ports and buttons
• Check the manufacturer's guidance before using alcohol on screens, because repeated use can wear down some anti-fingerprint coatings

What Not to Clean with Isopropyl Alcohol?

IPA is safe for most electronics, but not everything. Test a small, hidden area first, and skip IPA on:

• Acrylic or polycarbonate parts. Repeated contact can cause clouding or crazing.
• Screens with special coatings, unless the manufacturer approves it
• Painted, printed or glossy finishes that may smear or dull
• Rubber seals and gaskets, which can dry out over time

Working with plastics or coated parts? High-purity Ethyl Alcohol 99.5% is generally gentler on these materials. See Ethyl Alcohol vs Isopropyl Alcohol for cleaning electronics for a side-by-side.

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Common Mistakes to Avoid

• Cleaning while plugged in. Always disconnect power and batteries first.
• Spraying IPA directly on devices. Liquid can pool under keys and components.
• Using cotton swabs on circuit boards. Fibers snag on pins and solder joints.
• Using rubbing alcohol from the medicine cabinet. Most is 70% or contains additives.
• Turning the device on too soon. Trapped liquid can cause shorts.
• Using old or uncapped IPA. It absorbs moisture from the air over time and loses purity. Learn more in IPA Shelf Life: Does Isopropyl Alcohol Expire?

Safety Basics

• IPA is highly flammable, so keep it away from heat, sparks and open flames
• Work in a well-ventilated area
• Never clean components that are still hot
• Cap the bottle tightly after use
• Follow the product label and Safety Data Sheet

Stock up on NCL's Isopropyl Alcohol 99%, available in 32 oz and 1 gallon packs, or explore our full range of lab and industrial solvents. Need bulk quantities for your repair shop or lab? Contact us for custom pricing.

Frequently Asked Questions

Q. Is isopropyl alcohol safe for electronics?

Yes, 99% IPA is widely used for cleaning electronics when the device is powered off and the alcohol is allowed to dry fully. Avoid lower concentrations because of their higher water content.

Q. How long should IPA dry before turning electronics back on?

Wait at least 10 to 15 minutes for light cleaning. After cleaning a full circuit board or tight areas, wait longer to be safe.

Q. Can isopropyl alcohol damage plastic?

It can affect some plastics like acrylic and polycarbonate with repeated use. Always test a small area first.