Oh yeah, I have used Synthrapol and those color catcher sheets whenever I pre-wash batiks and hand-dyes. But I also color-sort the yardage, and straight-stitch the raw edges of each piece to the next one. I don't lose yardage to fraying any more, although ripping out the stitching is slow. I do not remove all the thread, I figure that will be cut off later when I true-up the fabric to the grain. (Note: I have a front-loader washer and dryer, so that's not a big contributor to fraying.)
I have yet to reach the point of a new finished quilt since coming back to the sport, so I will be using those tricks in the washer when the time comes! I was just worrying about when Donatella goes to wash my gift in her local water. Not that I can do anything about it. I'm not going to mess with shipping her some Synthrapol, and knowing her impatience with any household product fussiness, she wouldn't buy it herself.
Years ago, I dragged her to the Farmacia while vacationing with them, to get her an antihistamine for her sneezing. I and the pharmacist managed to understand each other despite my lack of Italian at the time, but Dodo had never heard of this category of OTC medicine! She reminded me this year, that I taught her about that, and it comes in handy raising their daughter
Kind of like the Epsom Salts usage in different countries, eh? It's all so fascinating to me!