comments:
You are missing the brush/pen. I use a cloth only if blower then pen were not enough (which is quite rare). All lens cleaning fluids are about the same, mostly isopropyl alcohol. Those sold for eyeglasses are fine. The problem is more the cloth and any dirt that it could have picked up. Sensor swabs are worth buying if your sensor is very dirty and the blower isn't enough. The main feature of these swabs is that they are a bit wider as your sensor is high so a single swipe won't leave edge marks since the edges are outside the sensor. You can also invest in a set of small cleaning brushes to remove the dirt/crud that sets in grooves and around buttons. These can also be used to clean your PC/Smartphone (and if you do close-up/macro photography, whatever your subject is because your first couple of shots will usually reveal how grimy they are(*)). A plain toothbrush will also work but sometimes you prefer a straight brush. (*) As I found when taking pics for my latest camera sale. But the buyer congratulated me for the cleanliness of the camera.