I fully agree with Mike.
Xylene, Iso-butanol or toluene will do the job too and are just as toxic as acetone. On acetone you may pass out quicker though. %P
Iso-butanol is the by far safest option IMHO but also the slowest.
If tiny bits of residual resin remain they are most likely to harden by the catalyst of the new layer you are going to apply so don’t worry to much about it.
Should you have to scrape of the glass weave as well, you have to get new glass. Unfortunately I don’t see a way of saving it.