Oops. Don't. First blow it out with another canister vacuum or air hose. That's usually sufficient for removing dirt and dust. For dust/dirt in the motor, use a motor cleaning spray that can be picked up at most auto parts stores. One that evaporates quickly and doesn't leave a sticky residue. One's called
Electric Motor Contact Cleaner by Gunk (
http://www.gunk.com/CAT_NM1.asp). There are others.
Hobby shops may also have one available called Dynamite Magnum Force 2 Motor Spray.
It shouldn't be that dirty unless someone has been using generic "made to fit" Electrolux bags. Or if water or other liquid has been vacuumed, resulting in rust, etc.
Keep in mind that reassembling the vacuum is more difficult than taking it apart. If not done so correctly, various problems may result. While you have it apart, it would probably be a good idea to use pipe cleaners to clean out the tubes connectiong the "control valve assembly" to other parts of the vacuum. Also, unscrew the knob at the top of the "cva" to check for wear and breaks. Clean dust thoroughly from all interior parts.
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