I found quite alot of dust ( small fabrics from clothes or some other sourcres, got the gist?) and found that they are on the lens in the camera itself. I tried using the brush from my lens pen but it just leaves more dust. I am so vexed up now, what can I do? I hope I won't have to send it to Nikon, my granddaughter's birthday is today.
Try a weak air blower. Don't recommend compressed air as it may be too strong and cause damage. I've learned it's best not to physically touch the lens.
First of all, unless there is a ton of it, it should not have a huge impact on the pictures you take. I have found that some work with my Rocket Blower is usually enough to clear it all up when I do feel the need. I'm not sure if it's technically the right thing to do, but I have occasionally and carefully used a microfiber lens cleaning cloth when there is a stubborn bit. Are you seeing the dust when you take pictures with the lens?
I carry around some pre-moistened hama ProOptic wipes. They're antistatic, and the pre-moistening takes much thought out of the whole problem. Just wipe off, and polish when it drys. They've given me perfect results (disregarding my own stupidity sometimes like accidently touching the lens and having it again) every time. ^.^