Even cheaper...go to your local post office and buy a bottle with a sponge tip. Normally it's used to moisten stamps but it works great for applying water in a specific area with good control.

Love this idea! I have two toddlers who love their Aquadoodle, but I never thought of using a pen to remove the blue marker lines!

I'm going to have to steal one of the Aquadoodle markers for my sewing basket!

Great tip!!!

Wow! That is a great idea -- and I happen to have one of those toys here! By the way -- it's a great toy as well if you're looking for a fun gift for a preschooler. The kid will like it because it's fun and the parents will like it because there's no mess! I think I've seen the pens for sale alone, but if you can't find them, you can get them online for $5.99.

http://www.aquadoodletoys.com/proddetail.php?prod=70683

Thanks for sharing!

I read this tip on QIAD message board. The Aqua Doodle toy is great for removing the blue marks from the water soluble pen. The Aqua Doodle is a marker that has only water in it. Now isn't that a great idea.