Denatured alcohol is grain alcohol or ethanol that has additives in it to make it unfit for human consumption. It is not the same as isopropyl (90%) as the isopropyl contains ~ 10% water. The denatured alcohol contains <0.1% water and probably would work better because the glue may not like the higher water content of the isopropyl.
Give the isopropyl a try, you may just need more of it and or a longer contact time to completely dissolve the glue.
I would recommend washing your mf after the glue removal to make sure any residue was completely removed.