Took a headlight bulb out last night to check if it had gone (it hadn't, the
holder had burned out!!).
I fixed it all today but now the inside of the lens is a bit misted up. What
is the best way of clearing it. I am thinking of removing the bulb and using
a hair drier. If so, do I refit the bulb whilst it is all warm - or let it
cool down first?