if i nap during the day do i say mode ani when i wake up or just wash neigel vasser?
Just wash negel vasser. We only say mode ani after the main sleep of the day, which is the nighttime sleep.
See Aderes Tiferes -1 who discusses your question, and one of his answers is what I wrote. Also see Teshuvos Avigdor Halevi, Also see Piskei Shemuos (shevuos) pg. 84.