I use a Q-tip with a little By Terry Eclat de Teint in Lumiere Rose. http://www.marieclaire.fr/,soin-lumi...0400,16525.asp It works for smudged mascara as well as wandering eye shadow. It even has diffusers in it that make the skin there look better too. Sometimes I use it for a subtle highlighter on my brow bone too.
When I was a makeup artist, I applied foundation and concealer to the under eyes, last! This way, it looks fresh, crisp, and polished. Wiping away excess shadow, once you have already applied foundation, never comes out looking as flawless as it could, plus, you are just wasting your foundation and concealer by wiping it off. Give it a try, you will see it works great!
Do your eyes first, clean up any shadow fallout, then do the rest of your face. perfection ensues
I was just about to say that.
It doesn't work too well for me though, i always wear glitter eyeshadow, and removing the glitter fallout is virtually impossible, so i just sparkle all over my face. I was never very keen on looking too groomed anyway :/