I keep both the Clorox Bleach Pen and Clorox Stain Fighter Pen for Colors in my bathroom and my laundry room for "oops" help. But what happens when you're on your way to a meeting or an interview and spill coffee, mustard, ketchup, or some other nasty thing on your clothes? Whether you're driving or taking public transportation, you probably don't have immediate access to water. Even if you did, walking into any kind of social situation with a stain or a big wet spot on your shirt, jacket or pants is not a great way to make a good impression.
The Clorox Stain Fighter Pen holds the answer if it can be redesigned to incorporate a rinsing agent for travel. The On-The-Go pen could have a wedged "pen" on the top similar to the wide end on the present Stain Fighter. Rather than having a second "pen" on the bottom there would be a small sponge through which water would flow to rinse out the cleaning solution. The cleaned stain could then be dried with a piece of super absorbent fabric (i.e. Sham Wow) stored between the two halves, which could be unscrewed.
The On-The-Go pen would need to be wider than a regular Clorox Stain Fighter Pen because the top half containing the cleaning agent could be removed from the bottom, which would be filled with water. A square or circle of absorbent fabric could be stored between the area containing the cleaning agent and the water container.