Yup, talking about THAT white square stuff.
I'm not sure what that stuff is made of, either. The difference from cotton for example appears to be, when made wet, cotton will absorb liquid into the fabric and into the thread themselves. This stuff retains liquid in between the treads but not into the thread. It always left streaking marks when used with lens cleaning liquid.
I never use ordinary paper product of any kind.... When used to clean eye glasses, which is usually made of polycarbonate (easily scratch-able) they can leave scratches. I don't use it with camera lenses either.
I dunno... microfiber cloths always works for me so I'm sticking with that stuff (and can of air and blow brush stuff).