It works! (I guess I should be embarrased that my floor was that bad.) Enjoy!
Again, using the sewing scissors, snip little snips through the edges of the mop head, to the sewing line, (don’t cut through the sewing line) about 1 inch apart. Then make little 1 inch a part snips, down the rows you cut the length of the mop head. You have created lots of little surfaces to help pick up dust.