After years brick's colour changes because of dust, sand and other contaminations which cling to a brick's porous surface. Joints between bricks are perfect place for accumulation of microorganisms, litle insects (our children are afraid of them very much). Joints between bricks are place of insects', spiders' incubation and therefore let us to clean them by using detergents and high pressure cleaning equipment. Bricks will recover freshness, colour and esthetic appearance.