there are those soft brush for cleaning your lens, their hair are very soft and u dont need alot of force to brush off dust.
just turn your camera down and gently use the brush to brush the sensor (sensor or filter protection and the soft brush is not going to scratch it) the brush will dislodge those stubborn dust and use the blower to blow the dust out.
you should use the blower, if still cant then the brush can come in. just need to point your cam downwards when doing your cleaning for best result. you can also point your cam down and trigger the cam auto cleaning function in hope to shake the dust off the sensor surface and let gravity pull the dust off
those special kit is sensor swipe which are like your lens paper made of micro fibre which will not scratch the glass or sensor when (gently) swipe over. the wipe also have some cleaning solution that dont leave residue.
tried manual cleaning ... with blower.. in the end some spots went off.. some new spots generated haha ,,, well i jus sent down nia .. ard 3 weeks ago then never change any lens since then .. but y do the dusts still gets into the cam..
this i really very sianz but it only affects at F16 and above..
heng i seldom use.. if need to use then i send CSC... bo bianz