Try nail varnish remover with acetone (sp), Dont know if it will work but it got nail glue off my clothes!
Test it on a small patch where no one will ever see it though first incase it damages the material!
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There is such a thing as nail glue remover- sold in Boots and the like. That might have a better chance of not damaging the sofa (and the cushion padding) than acetone.
If you're going to use either then I think you need to do a patch test on an inconspicuous bit of the sofa (like a bit that's against the wall) to make sure that it's not going to bleach or dissolve the sofa.
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