I had the same thing happen when I used the orange marker, however I washed it twice and the lines still remained in one particular fabric. I am guessing that it was not pre-washed (I don't prewash my fabric, but lots of it was prewashed by the previous owner). Anyway, It must have reacted to the way that fabric was treated. I made a concentrated solution of oxyclean detergent & water, then scrubbed the marker lines with that using a toothbrush. Then I let it sit for a few hours then washed it for the 3rd time. Finally the marker came out.