I noticed that some of my photos I took recently with my new A55 while on a vacation have a dark grey dot on the upper left corner. I'd presume it's due to dust/dirt on the sensor? So, I understand a couple of solutions I could take to remove it (correct me if I'm wrong):
1. Use Sony's Auto Cleaning Mode to clean the image sensor.
2. Use a blower.
3. Pay $$ for a shop to clean it (safer and done by experienced personnel)
Is Option 1 viable? I read a couple of posts from some forums and there are people saying the Auto Cleaning Mode doesn't work well and whatnot. For Option 2, there are others who say that a blower blows dust down and might accumulate on the bottom (can't remember exact details).
Please advise. Thanks in advance!