we are living in an old farm house and the wall around window in the bedroom is usally covered in dampness. the main reason for this is that the rubber seals around the window have come loose over the years causing condensation to build up. the wall around the window was drywalled about 3 years ago but now the dampness still appears. is there any cheap quick remedy to this as we are moving out in the summer as we are currently building our own house ?