Graphite remover?

Through an awful quirk of kiddie fate, a new painting was scribbled upon. The area is about 3 x 4 inches, loose but definite graphite marks, about a 4B, I think. The painting is dry to the touch but only a few days old.

Can I get rid of it? Do I:

a. Wait another week or two of curing, then gently rub with a turp-soaked lint-free cloth?

b. Immediately do above rubbing, and hope for the best on losing layers?

c. Some other wizardry?

It wasn't a masterpiece or anything, but I'd sure like to keep it anyway. The kid too. Any help you can offer is appreciated!

Thanks
Lisa