How to make 'dumb ways to die' puke clean up style game in Corona.

Hi Everyone!

Hopefully one of you can help me out.

One of the games in the ‘Dumb Ways to Die’ app is a puke clean up game. Basically you have to rub the screen to remove puke/vomit from the screen. You can see what I mean in the YouTube video below. How would I implement this in Corona? I think the ‘Dumb Ways to Die’ game was made in Flash.

Thanks in advance,

Ricky.

http://www.youtube.com/watch?&v=xo-oAy1AsYs