The fibers of the Ultimate Cloth are processed in such a way that they are able to grab and hold dirt, dust and grime. This is the magnet effect.
We call it 'Tough & Tender' because it's tough on dirt, yet gentle enough that a clean cloth will not scratch or damage any surface. We stress the word 'clean', because dirt will scratch, but the cloth will not. If you have previously cleaned a surface that has pulled dirt into the cloth, it's important to wash it prior to using it on a delicate surface.