heres my tip, soak them in daz for 24 hours, lots of daz this way gets all the brown horrible dye out, then wring them out wash them at 70o with daz again, and then when you use them flick them and you would if you was whipping someone with it, after a few days of this every time you wring out the scrim, you stretch the fibres and break them in.
also they might have a double folded edge, unpick this and re hem it, makes the world of difference