I live in a really old, really cold house (no double glazing, no insulation etc.) and we are having a serious problem with condensation and mildew in our bathroom. It is worst behind the toilet cistern as the bathroom is downstairs and the toilet is against an outside wall. It is disgusting and everytime I clean it is just runs down the wall in big black streaks! I can't get rid of it! Is there anything I can put on it to get rid of it for good? Or is it a case of waiting til it gets warmer and taking the whole thing off and giving it a good clean? Sorry for the long post, but this is really annoying me and I'm sure it's not healthy!