Wiping a case is not the same as cleaning and lubricating a movement. Routine exterior care may suit an owner; movement servicing involves dismantling, inspection, cleaning, correct lubrication and adjustment. Seiko describes those steps as part of service by technical specialists. If a watch is valuable, sentimental, water resistant or still under warranty, arrange professional service rather than opening it to experiment.
| Task | Sensible boundary |
|---|---|
| Wipe a dry case or crystal | Use a clean, soft cloth and the maker's care instructions |
| Clean an exterior bracelet | Follow the watch maker's instructions; keep water away from non-water-resistant watches and vulnerable straps |
| Clean an open movement | Training and movement-specific service instructions required |
| Oil a movement | Leave to a trained watchmaker unless following formal instruction on a practice movement |
Why oiling is not a drop-everywhere job
Different points in a movement need suitable lubricants in controlled amounts. The BHI watch-servicing course covers cleaning, lubrication and reassembly as a structured skill, including avoiding over-oiling. A bottle of watch oil and a pointed oiler are not enough to identify which oil belongs where, or whether the parts are clean and undamaged. Adding oil to a running movement can trap dirt or leave an underlying fault unresolved.
For learning, use an inexpensive practice movement and a course or reliable servicing material that names the calibre. Keep an organised parts tray and follow the movement maker's technical documentation. Do not open a mainspring barrel or attempt to service a watch you cannot safely reassemble and test.
Cleaning products need their own precautions
Cleaning solutions are not interchangeable. Elma's EC 95 safety data sheet identifies its product as an ultrasonic cleaning concentrate for jewellery and watch components and lists hazardous ingredients; that does not make it suitable for every material or every use. Follow the exact product label and safety data sheet, and use the ventilation, protective equipment and disposal controls they specify. HSE notes that solvent exposure can happen by breathing vapour or through skin and eye contact; ventilation is required, with more control needed for higher-risk products.
Use watch-cleaning solutions with ventilation and follow their safety data sheet. Keep chemicals labelled, closed and away from food, children and ignition sources. Never substitute household solvents or mix products. If the sheet is unavailable or the use is unclear, do not use the chemical.
Opening a watch can void its warranty and its water resistance. Water-resistance testing needs proper equipment. Read the regulation basics for a related service boundary, or ask a professional to assess the watch.
Sources & further reading
- HSE: solvents · Checked 2026-10-25
- Elma: EC 95 safety data sheet · Checked 2026-10-25
- Seiko: mechanical watch servicing · Checked 2026-10-25
- British Horological Institute: watch servicing course · Checked 2026-10-25