All you guys saying you're using 91% isopropyl alcohol....you sure that's what you're using? I'm almost certain that isn't the stuff you can buy in the supermarket, the iso that I get is only 70% and it works killer, obviously mixed with salt. I think the 91% stuff is for labs and such.
Anyways, ya don't need 91%, the weaker stuff works very good too.
had a buddy show me rock salt and room tempature water in a ziploc. only way ill do it now.
Grunge Off no doubt is the best, but if your on a budget then 99% ISO and salt will do the trick. With GO there is no shaking though, just leave to soak for a bit and your glass will look like brand new