Short answer
After each use: isolate the power, brush off clippings, remove sap with blade cleaner, then apply a thin film of blade oil along the blades. During longer jobs, add a little oil as you go. This keeps the blades running smoothly and prevents rust.
Routine after each use
- Isolate the power: remove the battery, unplug, or disconnect the spark plug cap.
- Brush off clippings and debris, especially around the blade bar.
- Wipe away sap with a cloth and blade cleaner or a suitable solvent.
- Apply a thin line of blade oil along the blades, then run the blades briefly (with the guard in place and following the manual) to spread it.
- Wipe off excess.
During long jobs
Resin builds up quickly on conifers and holly. Stop, isolate power, clean and re-oil if the blade starts to drag.
What oil to use
Use the oil recommended in your manual; many manufacturers sell a dedicated blade lubricant or spray. Do not use anything that can contaminate the hedge or ground in a way the manual warns against.
Rust and storage
Oil before storage, and keep the blade cover on. See how to store a hedge trimmer.
Always follow your own manufacturer’s manual: procedures, fuel mixes and service intervals differ between models, and a manual overrides any general guide.