@blessingscaptured, that’s a good question, about dust on the D7200 being more difficult to remove since it has built-in sensor cleaning. I don’t imagine that would be the reason why. I would think it would have more to do with how long the dust has been on the sensor, how the dust got there, and possibly even humidity levels that the camera has been in.
Before using a sensor wand, I generally try a sensor brush (for example: https://www.bhphotovideo.com/c/product/999238-REG/visible_dust_12300382_ez_sensor_cleaning_kit.html).
When using the wand, remove the shrink wrap, and if it’s not wet, definitely use a lens cleaning solution (like this: https://www.bhphotovideo.com/c/product/1070988-REG/pancro_pan001_professional_lens_cleaner_4oz.html). Something that won’t leave streaking or residue. I’ve heard that regular rubbing alcohol could work, but I’ve not experimented to make sure it was streak/residue free.