I like the air erasable (purple) marker and mark as I go. I use Leonis brand which I get on Amazon as they don't dry out as fast. Marks will last 30-45 minutes before I can't see them well enough. With the blue water soluble ones you can spritz and they will disappear to some extent however if any of the marker has soaked through the fabric into the batting you will see some more blue residue. You really need to wash it to get it all out.