I didn't realize how dirty my sensor was until I was outside today shooting with the 100mm I rented. I've known my backup camera has an issue with the same thing but didn't think about it until I saw the dust on this one. (totally blew my mind...

) I figure I'll clean both cameras. I was shooting between f22 and up and came back in and saw all the dust all over my pictures.
I have a problem though, I'm shooting a midday outdoor wedding this Sunday. What can I do between NOW and then? Im willing to do it myself, but need to know what do get locally since there isn't time to ship.
I shoot with 20D's. Any
help is appreciated. =) Thanks.