Miramist is a solid detergent. Place a tiny piece, the size of a rice grain, close to the edge of the dry dental. Wet it and then it will keep your mirror clean for half an hour. It is a surfactant which lowers the surface tension of the mirror surface allowing the water from thge dental spray to flow off. Keeps spectacles and optical lenses clear of mist, steam and sweat. Useful in the operating theatre