Hi, I have tons and tons of regular 100% white Fieldcrest de-seamed towels of various sizes. I"ve only used each a couple of times, and now they feel like they're getting a little harder everytime I wash them. I know Sal says not to use fabric softner, but why couldn't I? What else could I do to soften them up so I don't swirl my paint? I use the big ones for drying, the medium ones for QDing and buffing and the small ones for applications of waxes and car shampoos.