Posted July 30th, 2007, 12:11 AM
The fuzzies in the viewfinder were most likely on the top side of the focusing screen. the Rebel doesn't have a solid prism for the viewfinder, but what's caused a porro-prism made of glass panels and mirrored surfaces. Having fuzzies inside your viewfinder is irritating, but not a threat to image quality.
Brushing the sensor with a regular blower brush, however, is...
In you look on page 114 of you manual, it describes the method for locking the shutter open for manual cleaning, For this you need either a very, very clean statically charged brush to remove dust or a sensor cleaning swab and a specialized cleaning fluid like Eclipse to remove oils or other pollutants from the sensor. The sensor is very delicate, but can be cleaned by a user with care and some knowledge.
The Luminous Landscape has good articles here: http://www.luminous-landscape.com/es...cleaning.shtml
and here http://www.luminous-landscape.com/re...utterfly.shtml
I use a Visible Dust Arctic Butterfly 724 to dust my sensor and since I have never used anything but a sensor brush, I've never had to use a sensor swab and cleaner.
You may have to send it in for a cleaning and inspection this time since you used a regular brush...especially if it had ever been used on the outside of the camera or on a lens.