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A long strip of wet cloth, a cut up old towel works well. Put it down the back of the radiator, hold it at top and bottom and wiggle it. Rinse and repeat.
Last time I did this I found a sock down the back of one radiator that had been there since before we bought the flat (coming up 8 years now).
Alternatively, wait until you overhaul the central heating (at some point I want to put in thermostatic radiator valves) and then do them all properly then.
We've got dust inside the radiator, between the fins. How does the missus get it out?
I've tried the usual hit with a hammer approach but she swears blind she cannot get the dust out.