I only have the original not the iron off but I always wash my quilts when they are finished so no problem.
I found that if I take a damp wash rag and rub it over the area before I pounce it takes the chalk better. I do this all the time now.
I still prefer the dissapearing ink but you can only do a small amt at a time as it is gone quickly. So I only mark what I am going to sew at that sitting.