Toothpaste is the best substance I've used, aside from the actual disc repair kit I bought. Interestingly, the solution in the kit is 99% water, 1% ethanol.
Alcohol, petroleum jelly and nail polish remover are all serious suggestions. Alcohol will clean the disc; the other two will somewhat fill the scratch to make the surface of the disc level again. 99% of the time, the reason the disc stops reading it is because the laser beam is refracted at an odd angle by the angle of the scratch, not because the 'data' is scratched.
I daresay that if it's too scratched for toothpaste and a disc repair kit then I'd say you probably won't have much luck fixing it.
Edit: Rubbing alcohol like ethanol mixtures, not beer.
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