Maintaining your guitars
The following information applies primarily to acoustic guitars.
You'll also want to make sure your guitars are humidified to about 45% - 55%.
Wipe your strings after every playing session, some people seem to sweat more than others and have sweat that is more corrosive others.
Wipe your guitar with Microfibre or cotton cloths. (Old cotton t-shirt are a good source)
Keep two Microfiber cloths for daily use (one for the guitar, the other for the strings)
Add a little fingerboard conditioner to the fretboard of your guitar once a year
Ideally, keep your guitars in their case when they’re not being played for extended periods.
For stubborn grime clean your guitar with a little Naphtha (also known as lighter fluid)
Always wash and dry your hands before playing.
Use a little fretboard conditioner once or twice a year, a little on the bridge is a good idea.
Have the guitar looked at every now and then, have a set up done.
Be careful of your playing environments, air conditioners; do not allow any cold or hot air to blow directly onto the instrument.
Avoid polishes which contain silicones, silicone can making a repair to guitars finish difficult if ever it needs to be refinished.
Never leave the guitar (in its case) in the trunk of your car, high temperatures can be harmful. Avoid direct sun. Conversely, avoid freezing temperatures, when moving into another environment, hot or cold. Allow some time for the guitar to acclimate to the current conditions before taking the guitar out of its case.