achimha, according to MSDS on Prist's site, Prist Hi-Flash is diethylene glycol monomethyl ether - neither stinky nor very toxic, though it can damage paint (many years ago, I participated in the restoration of ancient frescoes in an Orthodox monastery in the north of Russia, and we used it in various mixtures to remove layers of oil paint on top of egg tempera). The stinky and toxic liquid you are talking about is probably tetrahydrofuran, also used for this purpose.