Searching Google for sensor cleaning, shows more than 3.780.000 ! pages. The problem: You need a clean sensor and that´s difficult ! The following idea is just for fun and on own risk:
I use these tools
# silicone remover
# The visible Dust sensor swap
# The visible Dust Arctic Butterfly
# patience
Have a look at this video for learning the wet-cleaning systematic
For holliday i packed the cleaning stuff in a handy otterbox. Don´t take the box in your hand-luggage! During holliday I clean daily!