Yep, scoosh, we use it sometimes aswell.
I think i got it away by exposing the prism thing, then getting an empty (and rinsed out) bleach bottle, and blew some air at it. Fine now
I was panicing for a second since its not mine (and I now have no intention of buying it since I am selling my 360 on Monday and my laptop at the end of the month.) didn't want to give it back with dust lol!
Thanks though, I found the thing with the blower on it when browsing the featured aticles bit of the page, and tried it out, making sure the camera was pointed down and blowing the air into the prism from below, making sure I had a full battery and that I didn't stick the tube into the actual mirror bit.
Canon EOS 5DmkII + BG-E6 + Canon EOS 40D + BG-E2N + Canon EOS 33
Canon 17-40 F/4L
USM + Canon 24-70 F/2.8L
USM + Canon 28mm F/1.8 USM + Canon 70-200 F/2.8L
USM IS + Canon 85mm F/1.8 USM
Canon Speedlite 580EX II + Canon Speedlite 540EZ + 2 x Nikon SB-80DX
Cactus V2s Wireless Trigger - 5 x
Cactus V2s Wireless Reciever