If you have carpets the moths are likely to have laid their eggs in dark places, under sofas, under beds, around the edges of carpets, behind and in long curtains. They especially like to lay the eggs in dust and on clothes that have been worn and have traces of skin and body grease. This is why you should wash woollens before putting them away for the summer. If you look closely at infected areas of carpet or clothes you will see what looks like little rolls of dust, about 2cms long and pale grey. If there are several they may be sort of meshed together with a sticky looking substance. Inside these 'rolls' are the grubs. Eggs can live in the carpets for up to two years before hatching into grubs and eating their way out. The female moth dies after laying the eggs. The pheromone strips attract the male moths and break the mating cycle over time. You need to hoover the carpets well, especially around the edges then steam if you have a steamer and spray with the sprays shown in other replies. Dulwich DIY sells the strips and sprays or you can buy them more cheaply online. It helps to not have too many crowded dark corners in rooms with carpets that don't get hoovered regularly or thoroughly.