Have the gruesome twosome who show the world little cleaning tips got a website that may help ?
But, and I have done this on many occassion, have you got any 'left over w/paper' ?
If so, damp the back of a small piece big enough to cover the mark you have, then scrape the backing paper off so you are left with the thin top cover,
then carefully stick it over the mark, if done correctly an almost invisible repair is made..