I have never had any luck with the flour method, what has worked best for me is putting a paper towel over the glue, soaking it with 90% isopropyl and waiting 10-15 minutes then rubbing with the wet paper towel and some dry ones. Still a big mess and you have to be careful as sometimes the alcohol softens up the lacquer clearcoat and you can leave scratches in it if you are not paying attention.