Martin Guitar Company 0-45s stephen stills ユーザーガイド

The best way to clean your guitar is with a warm, damp
cloth.  This will remove harmful chemicals.  Your guitar is
coated in the highest grade finish available and is sensitive.
Any type of solvent, especially those found in plastic, vinyl
and leather straps, will mar the finish, as will alcohol, citric
acid, aftershave lotion, insect repellent and a number of related
substances.  Perspiration can also damage your guitar, so
keep it dry.  To polish it, use the special Martin polish and a
clean Martin polishing cloth.  We recommend wiping down
your instrument and strings with a soft, dry cloth before 
storing to remove harmful skin oils. Products containing 
silicone should not be used.

Tuning machines normally need very little care other than
periodic lubrication. Enclosed machines, the type with a
cover over the gears, are lubricated by the manufacturer,
but the open type should be lubricated once or twice a year.
Just put a little household petroleum jelly on the end of a
toothpick and place the jelly in the gears. Be careful not to
use too much because it catches dust which can wear out 
the machines.

Some types of machines are adjustable for ease of tuning.
The open type can be made harder to turn by tightening the
screw in the middle of the gear. Check this screw every time
you replace the strings because it can work loose. Most
enclosed machines have a screw in the end of the tuning 
knob that will make the machines harder to turn when the
screw is tightened. Not much tension is needed, so don’t
overtighten the adjusting screws.