I wipe my boards after every play, i clean them and give them a rub down with a tiny tiny amount of pure lemon oil every string change, i dont change strings as much as i possibly should, i have some ducks axe wax here i got for free from the USA and its not too bad.
If you over hydrate your fretboard, the oils just come weeping back out and stuffs your strings.
A friend of mine has been using "simple green all purpose" to clean his guitar fret boards
Safety & Environmental friendly Non-toxic, biodegradable, non-hazardous, non-flammable, non-corrosive so i suppose it cant hurt. Mine used to get a good dose of beer and whiskey