Every home has dozens of electrical connections: sockets, switches, terminals and the connectors in appliances and tools. Over time they wear, and the boxes that house them collect moisture and dust. An oxidised or dirty contact heats up, sparks and works intermittently.
This matters especially in Ukrainian homes and garages: temperature swings, condensation in unheated rooms and frequent use of generators and power stations during outages. Below we explain how to check and clean contacts safely yourself and when it is better to call an electrician.
What you will need
Important: Before any electrical work, isolate the circuit completely: switch off the breaker at the consumer unit and confirm with a tester that there is no voltage. The main board, incoming breakers and the meter must only be serviced by a qualified electrician. If in doubt, do not take risks and call a professional.
Step 1
Wall sockets and switches
If a socket or switch is unreliable, isolate it, remove the faceplate and inspect the connections. Push any loose wires back in and tighten them firmly in the terminal. A damaged switch or socket must be replaced, as cleaning will not fix it.
First blow out the dust with compressed air, then treat discoloured terminals and contacts with WD-40 Specialist Contact Cleaner. It removes dirt, oxidation and condensation, is safe on most delicate materials and evaporates quickly.
Step 2
Junction boxes
Junction boxes hold bundles of connected conductors. If a socket or light point does not work, first make sure the device itself is not at fault, then trace the line back to the box.
Check every connection. Undo any loose one, treat it with contact cleaner and reconnect it securely. You can treat the other connections in the box as a preventive measure too. Only close the box once the product has fully dried.
Step 3
Consumer unit and circuit breakers
Removing and refitting breakers, RCDs and the main switch is difficult and dangerous, so this is a job for a professional electrician. On your own, only inspect the board with the supply switched off, looking for discoloured, melted or disconnected wires.
If you notice signs of overheating or a burning smell, do not try to fix it yourself; call a specialist.
Step 4
Household appliances and power tools
The contacts in appliances and tools are usually inside the housing. Before opening it, make sure you will not void the warranty or compromise the device. The appliance must be unplugged, and a cordless tool must have its battery removed.
Clear dust from the vents and brush assembly with compressed air. Treat oxidised terminals, battery connectors and switch contacts with contact cleaner, let them dry and only then reassemble.
Step 5
Electrical contacts on cars and motorcycles
Vehicle electrics constantly suffer from water, dirt and road salt. If something works intermittently, inspect the connections, check them with a tester and refit any that have come loose.
Treat connectors, terminals and blocks with WD-40 Specialist Contact Cleaner: it penetrates hard-to-reach areas, restores conductivity and displaces moisture. The non-conductive formula evaporates quickly and leaves no residue. Disconnect the negative battery terminal before you start.
Tip: Spray in short bursts and only onto isolated contacts. Always let the product evaporate completely before restoring power. For dust in electronics, compressed air is better than a brush, as it avoids static and stray fibres.
What next
Inspect the contacts in your garage, country house and seasonal equipment such as a generator or pump once a year. Regular cleaning with contact cleaner extends the life of connections, and any work inside the consumer unit should be left to professionals.
These uses come from the experience of WD-40 users in many countries. Always follow the instructions and warnings on the product label.
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