Here's a quick look at a Camera Vacuum product that was sent over by a Japanese company called Fujin. The cleaner attaches exactly like a lens and is designed to suck floating particles out of your camera body.
I think the keywords here are 'Floating Particles'. If you have a smudge on your sensor or something wet (mud), it's not going to be much help. But if you happen to be in a situation where there is a lot of dust, dirt, lint, etc it might be able to clear that out. But at a price of over $150 US, I personally don't think I have a need for something like this, but your needs may be different.
Here are some other videos from their YT page.
So I guess they are looking for more comments and feedback, feel free to leave your comments below.