once in a while, everyone needs a good one
I tried using cotton buds with alcohol but seems to leave a stain on the sensor. In the end, I just use the plain cotton buds and clean away. Had a hard time cleaning. The dust seems very stubborn, difficult to remove and keep moving to different positions .... And though the blotch seems major, I can't see any dust speck on the sensor. Just gotta based in on guesswork and from where the dust appear on the taken shot.
But I was rather "suay". I didn't know the blotch on my sensor until 5 mths later after using the cam, and it's brand new. It only appeared when I took night shots using small apertures. And I thought it was a stain on my UV filter ... Now I browse through my previous pics taken 5 mths ago and indeed, could faintly see the blotch on some pictures ...
if i remember correctly, the image/sensor is inverted right? that is to say if the dust speck is at the bottom right corner of the pic, on the sensor it is top right?
need to know where to clean. =)