I just finished quilting a whole cloth quilt made with an old hand embroidered sheet and marked with blue wonder marker. I thought I would be smart and soak it in quilt soak to try and get the yellow spots out at the same time I would get the blue lines out. Ouch! BIG mistake. I now have brownish green feathers and cross hatching. I am very interested in how I can remedy this. I now have recreated 4 sample yucky permanent marks on scrap white fabric. One is soaking in lemon juice, one is soaking in peroxide, one in vinegar, and one in pure rubbing alcohol. If any one has any other suggestions I am all ears. I will turn in my results as soon as I have any. Nothing has happened so far but it has only been a few min.