You may get both as what Joseph K stated. Try the Eyelead gel stick first & if there are any spot / spots that can't be removed then use the wet cleaning. In my experience, I was successful with the Eyelead gel stick that I haven't done the wet cleaning for a while now. Or, you can do it one at a time, starting with the Eyelead. Using the Eyeead is very easy & only takes a minute or so to clean the sensor.
I use the VisibleDust system. Make sure you have all the tools including a VisibleDust Quasar Sensor Loupe 7x, arctic butterfly brush, bores head brush. follow the directions and use the liquid very sparingly if it comes to that.
clean outside of camera first then mirror box then sensor.
use a blower first, Arctic butterfly brush, check sensor between each step with the VisibleDust Quasar Sensor Loupe 7x. stop when you don't see any dust.
if you still have dust you could go to gel stick next then if its still there use the liquid.
one or two drops is sufficient and a very light touch on the sensor go across in one direction and the flip the swab over do not use the swab again take another if you still see dust.
Do Not touch the mirror its extremely fragile and easily knocked out of alignment or scratched.
its sounds harder then it is most likely the blower and dry brush will be as far as you need to go
If you get streaks with the liquid don't worry just let it dry and try again.
I have done it with the D600 a few times before the shutter recall. It was probably the worst sensor I ever had to clean it looked like it was attacked with a black can of spray paint when I first looked at it. watched the videos on youtube a few times before you start.