I noticed a spec of dust on my sensor. So I got out my trusty blower/brush to get rid of it. I accidentily touched the sensor with the brush and the fibers must have had oil (body oil?) on them because there is a smudge on the sensor. And yes, it shows up on pictures. Luckily it is in the lower right hand portion of the horizontal frame and won't completely ruin most shots..............until I go vertical and it's in the sky. I'm new to this camera. Can I clean it safely or do I need to send it in for cleaning?