Run the General Purpose Cloth under the tap and then wring it out. This “charges” the cloth by filling the microscopic voids between and within the cloth’s fibres with water. When you draw the cloth across a dirty surface, those water molecules attract and stick to particles of dirt, grease, grime, even bacteria and mould, pulling the particles into the voids and trapping them there. Rinsing the cloth with warm or hot water, or running it through a machine wash cycle, releases the trapped particles and refreshes the cloth. Amazing.