Be careful rtjdesign, "Lenspen" is a trade name. Lenspens designed to clean lenses CANNOT be used on DSLR sensors. But they DO make a product designed just for that, have a look here: -
http://www.lenspen.com/?cPath=&products_id=LP-1&tpid=146
Pete
Have you tried 'improvising' with a household vacuum cleaner? I bet that question has made a few hairs stand on end.
When I was skint..still am....I was desperate to clean my sensors but didn't want to touch them physically, not even with a soft brush.
In the end I got a small bore plastic tube about a foot long and taped to the end of my vacuum cleaner pipe using gaffer tape:bonk:, and very gingerly hoovered the inside of my camera without touching anything, incredibly, it worked pretty damned fine and got 99% of the crap out, the couple of bits it left behind I cloned out the images.
I don't really say 'do this yourself' just saying what i did when I had no other way of cleaning the sensor and got away with it, I now have a Delkin sensor cleaning kit which is pretty mustard but expensive
Just PM'd you with suggestion
Dont use a hoover, a lenspen, a cloth, a squirter, or an anteater.
Either get the proper equipment (sensor cleaning swabs or pecpads etc), or pay someone to do it.
Trust me, you *will* make matters worse
Sensor swabs; sensor cleaning fluid and cleaning guide despatched this morning.
Allow a few days for delivery, not only because I live in remote part of valley but as much as I love 'em, the French do things in their own sweet time, no such thing as next day delivery here I'm afraid.
Ryan, it is important you read the guide and follow the guide fully, the crap has been on your sensor a long time and the potential for damage huge and as mentioned in other correspondence, if you have any metallic based dust stuck on there, the damage is probably already done.
The cleaning fluid and swabs are made specifically for sensor cleaning but even so, you have to be ultra careful.
The cost of repair is crippling and would probably be cheaper to buy a new camera and as you are clearly in the same boat, H.M.S. Skint, I sailed in a couple of years back, that is not an option. Goodluck.