Nikon DTM-502 Series Instruction Manual page 9

MAINTENANCE
Read This Section Before Use!
Do not use organic solvents (such as ether or paint thinner) to
clean the non-metallic parts such as the keyboard, and the painted
or printed surfaces. Doing so could result in discoloration or in the
peeling of printed characters. Clean only with a soft cloth or tissue
lightly moistened with water or mild detergent.
Optical lenses may be cleaned by lightly wiping them with a soft
cloth or lens tissue moistened with alcohol.
Do not leave the carrying case exposed to rain for an extended
period of time, though it is designed to be watertight. If you
expose the carrying case to rain because of unavoidable
circumstances, place it with its "Nikon" nameplate upward.
The BC-80 battery pack holds Ni-MH inside. Be sure to follow the
laws or rules of your municipal waste system when disposing of it.
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