Remove / refill is really the best way.
You can get thin pads for doing behind radiators which are better than mini rollers if you're really not keen.
Thanks a lot, I need to remove wallpaper behind the rad first so having more elbow space would be useful. Will get searching how to refill the system.
Can it wait till after the heating goes off?
Actually do you have a combi boiler and what are the taps either side of the rad like?
@jambon started
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Remove / refill is really the best way.
You can get thin pads for doing behind radiators which are better than mini rollers if you're really not keen.