I've had problems with all three of the aforementioned colors (blue, yellow, and grey.) Used them on a couple of rag quilts and
none of them washed out. Completely ruined the quilts! I was so mad - they were supposed to be Christmas gifts for my grandsons.
The only markers I use now are the Crayola Ultra-Clean markers. Never had a problem removing any of the colors, even after ironing them.