I came up with this idea when I was in the hospital recently. The elevator buttons grossed me out! I didn't want to touch them, not with my pen, and certainly not with my fingers. I knew the hospital's hand cleaner would be empty at my destination, as usual. I would wait and pray for someone to come along and press my floor, that or begrudgingly use my pen.
My idea is for a pen with a Clorox "swab" or "button" on the end, with a removable cap, and a clip so you can even carry it around in your pocket, as well as a hole on one end for a string to go through, in case you want to loop it around something and hang it on your book bag. Use it to press those disgusting elevator buttons or even touch keyboards that don't belong to you, if you are using them briefly and there's no hand cleaner nearby. I'd keep one in my purse just for those occasions when I don't want to touch something disgusting but I have to. Might as well kill the germs you get on your device by touching whatever it is with bleach. Just don't use on clothing. Must come with stern warnings for people that will try to use it as stain remover.