I find cloth,cotton shirts etc, can cause problems. First if washed in detergent with silicone for a softner, will reek havoc with varnish and cotton tends to leave fibers behind.
I prefer coffee filters, fold over once, use enough area to cover three flats, one swipe down turn and do the next three flats. Sectioned off by the guides, otherwise continue as far as you can reach, one swipe.
Pete