You are not cleaning the sensor. You are cleaning a piece of glass on the sensor. It is considerably stronger than you think. Millions have had their sensors cleaned using any means available.
Here's a tip. Avoid smallish apertures. Spots are very hard to see if you shoot wide open. F8 and smaller should be avoided.
I was at the local airport shooting a skycrane as it was warming up. I was using f14 because I din't have time to check aperture. I got there as it was just getting ready to take off. Every bit of dust showed up.
A couple days later I was shooting at f4 and the dirt magically disappeared.
Eclipse is one of the best for cleaning. The trick is to use only one drop of liquid on the pec pad. The first time I did it I was as nervous as a long-tailed cat in a room full of rocking chairs. By the time I did it again (D700) I felt like an old hand.
BTW, I use an old ear syringe I cleaned out well. Much cheaper than the Giottos rocket.
"Beauty is in the eye of the beholder and it may be necessary from time to time to give a stupid or misinformed beholder a black eye." Miss Piggy