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Simplest answer to this is...during the summer...when the heating is not being used...every couple of weeks or so, just turn the valves up and down, to keep them free, you don't need the heating on, just move them as someone goes round with a vac?..

Wouldn't recommend WD40...I left a Worcester filing key in the bottom of my toolbar, with a can of WD40, the can went off spraying the O ring on the key...some days later...picked up the key..the O ring had expanded to 4 times it's size ..would recommend some thing else..