Okay all, I'll let you know how my quilt came out. You just won't believe this. I took Shana's suggestion and used baking soda and water to get the yellow chalk out. I did this on the table not in the machine. The chalk came right out!! DH & I were smiling and doing a happy dance. I forgot all about also making some dashes with the purple air-solluble pen too!! AND THEN, AND THEN, as the quilt was drying, alas, what should appear out of nowhere but purple dashes everywhere!!!!!!!!!!! Now, how to get rid of these? I used Oxi-clean with a Q-tip on each dash. This was a full afternoon work getting rid of these. But it did work! When I ironed it there were still a some places that flashed purple but faded as they cooled.
I emailed the Clover company that made this chalk. They apologized for my inconvenience and said to use 5 parts water and 2 parts vinegar to get the chalk out and let AIR DRY. Do not put in dryer.
Bottom line, my customer picked up the quilt tonight and just loved it!! I didn't tell him about my issues but told him if he had any problems with anything to just let me know.
Now, back to my happy dance.