The Germans have invented what is supposedly the world’s first backpack-mounted laser cleaner . Clearly there was a need for such high-powered cleaners. There’s no real explanation of how the laser cleans, but we can assume that it burns away layers of dirt. Probably not for use by children under three years of age, or any of us here, really.
The laser will make the rounds in the UK in November, demoed at universities and super villain hideouts.