Film, Media & TV3 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.I use a very long feather duster, which if used regularly is sufficient. If they haven't been cleaned for a long time though you may have a thicker build up of dust - when i moved into my new home i had this problem so unscrewed the long handle off my mop and attached some old rags round it. I used this along with detergent and hot water. Depending on the space between the radiator and the wall you should be able to do this, if not i would go hunting for something long, strong and thin. Good luck ;-)
You could use a bottle brush taped to a garden cane with electrical tape, or, if you're not up to it, then there's this.