I don't have anysure fire methods for removing the bleed, sorry. I don't use embroidery floss on Red Work anymore. I use DMC Coton Perle. My favourite is #8, colour 321 and it is 100% coton and colorfast. It is made in France which explains the strange spelling. Mine comes on a little round 1,1/2 inch ball for about $4. It gives a nice outline with just 1 strand and is much easier to use. If you want to use embroidery floss (even the good stuff) check it for colourfastness before using it. Take a small wad of it and soak it in hot water. Put the wad onto a white kleenex or papertowel to dry. Inspect the towel after drying and if there is any colour transfer, don't use it. I'm sorry all your hard work is spoiled. You might be able to save your blocks by overdying them pink if you can't remove the bleeds.