Termite Attack!

One day, I was looking around the backyard when I noticed what looked like veins of mud sticking to the side walls of the house. It seems to be originating from the outer ceiling of the house (which is apparently called a soffit - thanks, Google). What made it more worrying is that it seems to have spread to the spare bedroom, which I'm currently using as a stockroom. This is not the first time we have been attacked by termites. I can still remember a particularly devastating infestation about 5 years ago, when the termites almost ruined everything …