i think may have messed sensor while cleaning it. "messed up", mean put dozen or fine scratches on filter sits atop actual ccd sensor.
reading forum on how people clean sensor, , general consensus don't need liquid unless weird stuck it, , "glass" filter on top quite hard , ultra-fragile , touch sensitive people believe is. people recommended taking soft cloth , wiping , forth on sensor. if can't put finger inside, cover small, hard object cloth, , wipe sensor that. make sure object doesn't have sharp edges. f***ed up. 
think went bit "medieval" , scratched up. used soft, thin cloth used wipe eyeglasses with. however, chose wrong item me. section of item used wasn't sharp. rounded , quite dull. however, edges sharp. when wiped sensor, think rounded edge pressed against sensor @ slight angle (rather flush/flat sensor), means sensor wiped edge of object.
hoping these scratches wouldn't visible unless shooting @ f/16 , other small apertures (ie: when shoot macro). however, wrong. can see them faintly @ f/5.6, , start "invisible" @ f/4 , below. messed up. 
there can take away scratches?
i think only thing can have repaired professional nikon-certified repair shop... unfortunately. sorry hear misfortune...
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