Anyone who’s tried to clean a thick shag rug or a plush wool carpet with a lightweight cordless vacuum knows the frustration. The head glides over the top, the indicator light stays green, and yet somehow the carpet still looks dull and full of trapped dust once you’re done. Deep pile doesn’t behave like a normal floor. Dirt and hair work their way down into the base of the fibres, well below where most modern machines are actually designed to reach.
