Guys, I need some help here and will appreciate any info.
Here is what happened: I was changing lenses while hiking up a mountain range (bad idea) when a sudden drizzle landed one tiny drop of water on the sensor. With the wind and cold, all I could do was to try wipe it away with my finger. Now I have a mark on the sensor - see pic.
How do I clean it? Can I use LensPen? I also have Giottos "Professional Multi Optical Cleaning Solution" - can that be used on a soft cloth and lightly wipe the sensor? I have never done this sensor cleaning business on any camera in my life.
Lesson learnt, never change lenses when it is windy and cold. Or at least use some protection.