I keep my 40D without the lens on but the body cap on , and I wrap the camera up in the soft fabric that came with it and in a closed camera bag.
Avoid using compressed air to remove dust, if can force the dust deeper into the camera and crevasses within and between bits.
A lens pen is the way to go, or simply blowing on it to dislodge dust.
I keep the lens caps on my lenses at all times unless I am actually using the lens , and if came with a case , it stays in the proper case.
My 40D has a builtin ultrasonic dust cleaning routine that is automatic when the camera is powered up.
I NEVER EVER touch the camera's internal filter or the sensor.
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