Quick verdict
A fast-drying, residue-free spray that flushes oil, dirt, flux and condensation off electrical contacts: cordless tool battery terminals, charger contacts, mower safety switches, trimmer triggers and the corroded connectors on landscape lighting and robot mower docks. A tool that cuts out under load or a pack the charger will not recognise is usually a dirty contact, and this fixes it in seconds. It is safe on most plastics and leaves nothing behind. Not the original WD-40, which leaves oil.
Strengths
- Cleans battery and charger contacts so packs charge and tools run
- Dries fast and leaves no residue
- Safe on most plastics and rubber
- Fixes intermittent switches and triggers
- From a maker with a long record in maintenance chemicals
Weaknesses
- Flammable; use with power off and away from flame
- Not a lubricant; moving contacts may want a separate product
- Aerosol can empties fast if used generously
The overall YardToolLab Score is out of 100. Section scores are out of 10.
The Fault That Is Only Dirt
A cordless pack the charger flashes an error at, a drill that stops under load, a mower that will not start because the bail switch has corroded, a trimmer trigger that works every third pull: most of these are dirty contacts, not dead parts. Contact cleaner fixes dirty contacts. WD-40 Specialist’s is a fast-drying spray that flushes oil, dirt, flux and condensation and leaves nothing behind.
This review is based on the maker’s specifications and on how no-residue contact cleaners are used in tool and equipment maintenance generally. We have not used this product ourselves.
Not the Blue Can
Original WD-40 is a water displacer that leaves an oily film. On electrical contacts that film attracts dust and insulates. This product is a different formula that cleans and evaporates completely, which is what contacts need. Read the can.
Where It Works
Battery pack terminals and the charger contacts they meet, where grit from a garden tool makes the charger reject the pack. Tool terminals inside the handle. Mower safety switches under the seat and at the bail. Triggers and speed controls on trimmers and blowers. The green connectors on landscape lighting and the dock contacts on a robot mower. Any connector that has been outdoors.
Using It
Power off and remove the battery. Spray the contacts until the dirt runs clear, let it flash off for a minute, and reassemble. For a switch, spray into the mechanism and work it a dozen times. It is flammable while wet; no sparks, no flame, ventilation.
Materials
Formulated to be safe on most plastics and rubber, which matters on tool housings. Test a hidden spot on anything painted or polycarbonate. It is not a lubricant; a sliding contact that wants lubrication gets a separate product after cleaning.
Who Should Buy It
- Owners of cordless garden tools whose packs get dirty.
- Mower owners with starting faults at the safety switches.
- Anyone with outdoor electrical connectors going green.
Common Owner Complaints
Cans emptying fast with generous use. Short bursts.
Technique Tips
Spray in short bursts with the straw fitted and let the liquid carry the dirt out rather than scrubbing with anything metal. Where contacts are green with corrosion, follow the spray with a pencil eraser or a fibreglass pen on the brass, then spray again. Let everything dry fully before refitting a battery; the solvent flashes off in a minute or two in warm air and longer in cold.
Alternatives to Consider
CRC QD Contact Cleaner is the close equivalent. DeoxIT for severe corrosion and a protective film. Isopropyl alcohol and a brush for small jobs.
Verdict
Before replacing a pack, a switch or a charger, clean the contacts with this. It dries clean, it is safe on tool plastics and it fixes more cordless faults than any part.
Full specifications
WD-40 Specialist Fast-Dry No-Residue Electrical Contact Cleaner, 13.3 oz FAQs
A pack the charger shows as faulty, a tool that cuts out under load, a mower that will not start because the seat or bail switch is dirty, a trimmer trigger that works intermittently, landscape light connectors gone green.
Power off, remove the pack. Spray the contacts until the dirt runs off, let it dry for a minute, reassemble. On switches, spray into the mechanism and work it a few times.
No. Original WD-40 leaves an oily film that attracts dirt and is wrong for electrical contacts. This is a different product that evaporates completely.
It is formulated to be safe on most plastics. Test an inconspicuous spot on anything polycarbonate or painted.
