If you use lighter fluid to clean the fretboard, you must condition it with either lemon oil, or woodwind bore oil, which is the best. the reason behind this is that naptha (lighter fluid) , like alcohol and other petrolium solvents with pull all the moisture out of the board and cause it to eventually crack and split because there mounted on top of a softer wood (maple usually) which moves and bends a lot, and if the board isnt soft n' moist enough to move with it, well, bad things...
also, these items are ONLY for rosewood and ebony boards, which are "open grain" woods that are not sealed. Maple is much to soft and therefore is alway sealed with a hard polycoat and really could be cleaned with a little soap and water.
You need very little to clean a guitar body because, like a maple fretboard, it is usually sealed in many clearcoats, just like a car. You could use a little soap and water, or pledge if you want your guitar smelling like grandma's house. You could even wax your guitar just like a car, but theres really no need for it.
also when cleaning a guitar, take a lot of care in NOT TOUCHING ANY METAL besides the frets, or you will have rust city in no time, especially with harsh petrolium solvents, which tend to be caustic..
