A lot of people don't think to clean down the back of the
radiators. You will be surprised just how much
dust , muck & dead bugs gather down there! I find it easiest to use a telescopic
feather duster & push it down the
radiator (when switched off). It doesn't necessarily catch all the
dust but it will at least push it out where you can easily
vacuum it up. (A lot of
allergies are caused by this
dust that we forget about!)