Although out of sight, the back of the radiator can build up dust quickly without you realising and is a difficult area to clean, especially if you have an extremely tight space between radiator and wall.
Try hanging a damp cloth or sheet of damp newspaper behind the radiator and blowing the radiator with a hairdryer. This will force out the hidden dust, forcing it to stick to the cloth or newspaper that you have strategically placed behind the radiator.
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