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A classical is built for nylon. Caring for it mainly means protecting the wood… and never putting steel on it. Whether it is a student model or a high-end instrument, the moves are the same — and they spare you many trips to the luthier.
Store and transport
- Hard case preferably (especially for travel); a well-padded gig bag is fine for careful local use.
- No car in summer (heat can unglue joints), no attic / cellar.
- After a big temperature swing, let the instrument acclimate in the case before opening it.
In the case: spare set, winder, cutters, cloth, humidifier if needed.
Humidity
Aim for 40–50%. A hygrometer in the case plus a humidifier in dry periods avoids cracks and a shifting neck. Thin tops and backs react fast: better prevent than repair.
In winter (heating) or dry climates, check regularly. A top that “sounds hollow” or a neck that moves are often the first signs.
Cleaning
- Clean hands, cloth after every session (strings + fretboard).
- Fretboard oil at string change (unfinished wood only).
- Light polish on the finish: spray on the cloth, not directly on the top.
Strings
Change the set at least every six months (more often if you play a lot), or as soon as the tone dies / tuning will not hold. Nylon strings only: steel can damage top and neck.
Keep a spare set in the case: simple, effective, reassuring. And if a crack or deformation appears, see a luthier rather than forcing it.
Source : Sweetwater – Classical Guitar Care and Maintenance Guide